282035
An object is placed at a distance of $20 \mathrm{~cm}$ from the pole of a concave mirror of focal length $\mathbf{1 0}$ $\mathrm{cm}$. The distance of the image formed is :
1 $+20 \mathrm{~cm}$
2 $+10 \mathrm{~cm}$
3 $-20 \mathrm{~cm}$
4 $-10 \mathrm{~cm}$
Explanation:
C: Given that, Object distance (u) $=-20 \mathrm{~cm}$ Focal length of mirror $(\mathrm{f})=-10 \mathrm{~cm}$ We know that, From mirror formula,
$\begin{aligned}
\frac{1}{\mathrm{f}}=\frac{1}{\mathrm{u}}+\frac{1}{\mathrm{~V}} \\
-\frac{1}{10}=-\frac{1}{20}+\frac{1}{\mathrm{v}} \\
\frac{1}{\mathrm{v}}=\frac{1}{20}-\frac{1}{10} \\
\frac{1}{\mathrm{v}}=\frac{1-2}{20} \\
\mathrm{v}=-20 \mathrm{~cm}
\end{aligned}$
Karnataka CET-2018
Ray Optics
282036
Match the following diagrams with the correct statement
| List-I| List-II|
|-----|-------|
| (a) | (i) Positive magnification, image on the opposite side of the object |
| (b) | (ii) Positive magnification $m>1$|
| (c) | (iii) Real image|
| (d) | (iv) No image|
1 (a) - (ii),(b) - (i),(c) - (iii),(d) - (iv)
2 (a) - (iii),(b) - (ii),(c) - (iv),(d) - (i)
3 (a) - (ii),(b) - (iii),(c) - (i),(d) - (iv)
4 (a) - (iii),(b) - (i),(c) - (ii),(d) - (iv)
Explanation:
A:
\begin{tabular}{|l|l|l|}
\hline (a) & (ii) Positive magnification \\
\hline (b) & (i) Positive magnification, image on the opposite side of the object. \\
\hline (c) & (iii) Real image form. \\
\hline (d) & (iv) No image i.e. image is formed at the infinity \\
\hline
\end{tabular}
TS EAMCET 03.05.2018
Ray Optics
282037
An object is placed at the principal focus of a convex mirror. The image will be at :
1 centre of curvature
2 principal focus
3 infinity
4 no image will be formed
Explanation:
C: The focus of a convex mirror is behind the mirror. Image is formed only when object is placed infront of mirror. Then image will be formed at infinity.
Karnataka CET-2018
Ray Optics
282040
Consider a light source placed at a distance of $1.5 \mathrm{~m}$ along the axis facing the convex side of a spherical mirror of radius of curvature $1 \mathrm{~m}$. The position (s'), nature and magnification (m) of the image are
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Ray Optics
282035
An object is placed at a distance of $20 \mathrm{~cm}$ from the pole of a concave mirror of focal length $\mathbf{1 0}$ $\mathrm{cm}$. The distance of the image formed is :
1 $+20 \mathrm{~cm}$
2 $+10 \mathrm{~cm}$
3 $-20 \mathrm{~cm}$
4 $-10 \mathrm{~cm}$
Explanation:
C: Given that, Object distance (u) $=-20 \mathrm{~cm}$ Focal length of mirror $(\mathrm{f})=-10 \mathrm{~cm}$ We know that, From mirror formula,
$\begin{aligned}
\frac{1}{\mathrm{f}}=\frac{1}{\mathrm{u}}+\frac{1}{\mathrm{~V}} \\
-\frac{1}{10}=-\frac{1}{20}+\frac{1}{\mathrm{v}} \\
\frac{1}{\mathrm{v}}=\frac{1}{20}-\frac{1}{10} \\
\frac{1}{\mathrm{v}}=\frac{1-2}{20} \\
\mathrm{v}=-20 \mathrm{~cm}
\end{aligned}$
Karnataka CET-2018
Ray Optics
282036
Match the following diagrams with the correct statement
| List-I| List-II|
|-----|-------|
| (a) | (i) Positive magnification, image on the opposite side of the object |
| (b) | (ii) Positive magnification $m>1$|
| (c) | (iii) Real image|
| (d) | (iv) No image|
1 (a) - (ii),(b) - (i),(c) - (iii),(d) - (iv)
2 (a) - (iii),(b) - (ii),(c) - (iv),(d) - (i)
3 (a) - (ii),(b) - (iii),(c) - (i),(d) - (iv)
4 (a) - (iii),(b) - (i),(c) - (ii),(d) - (iv)
Explanation:
A:
\begin{tabular}{|l|l|l|}
\hline (a) & (ii) Positive magnification \\
\hline (b) & (i) Positive magnification, image on the opposite side of the object. \\
\hline (c) & (iii) Real image form. \\
\hline (d) & (iv) No image i.e. image is formed at the infinity \\
\hline
\end{tabular}
TS EAMCET 03.05.2018
Ray Optics
282037
An object is placed at the principal focus of a convex mirror. The image will be at :
1 centre of curvature
2 principal focus
3 infinity
4 no image will be formed
Explanation:
C: The focus of a convex mirror is behind the mirror. Image is formed only when object is placed infront of mirror. Then image will be formed at infinity.
Karnataka CET-2018
Ray Optics
282040
Consider a light source placed at a distance of $1.5 \mathrm{~m}$ along the axis facing the convex side of a spherical mirror of radius of curvature $1 \mathrm{~m}$. The position (s'), nature and magnification (m) of the image are
282035
An object is placed at a distance of $20 \mathrm{~cm}$ from the pole of a concave mirror of focal length $\mathbf{1 0}$ $\mathrm{cm}$. The distance of the image formed is :
1 $+20 \mathrm{~cm}$
2 $+10 \mathrm{~cm}$
3 $-20 \mathrm{~cm}$
4 $-10 \mathrm{~cm}$
Explanation:
C: Given that, Object distance (u) $=-20 \mathrm{~cm}$ Focal length of mirror $(\mathrm{f})=-10 \mathrm{~cm}$ We know that, From mirror formula,
$\begin{aligned}
\frac{1}{\mathrm{f}}=\frac{1}{\mathrm{u}}+\frac{1}{\mathrm{~V}} \\
-\frac{1}{10}=-\frac{1}{20}+\frac{1}{\mathrm{v}} \\
\frac{1}{\mathrm{v}}=\frac{1}{20}-\frac{1}{10} \\
\frac{1}{\mathrm{v}}=\frac{1-2}{20} \\
\mathrm{v}=-20 \mathrm{~cm}
\end{aligned}$
Karnataka CET-2018
Ray Optics
282036
Match the following diagrams with the correct statement
| List-I| List-II|
|-----|-------|
| (a) | (i) Positive magnification, image on the opposite side of the object |
| (b) | (ii) Positive magnification $m>1$|
| (c) | (iii) Real image|
| (d) | (iv) No image|
1 (a) - (ii),(b) - (i),(c) - (iii),(d) - (iv)
2 (a) - (iii),(b) - (ii),(c) - (iv),(d) - (i)
3 (a) - (ii),(b) - (iii),(c) - (i),(d) - (iv)
4 (a) - (iii),(b) - (i),(c) - (ii),(d) - (iv)
Explanation:
A:
\begin{tabular}{|l|l|l|}
\hline (a) & (ii) Positive magnification \\
\hline (b) & (i) Positive magnification, image on the opposite side of the object. \\
\hline (c) & (iii) Real image form. \\
\hline (d) & (iv) No image i.e. image is formed at the infinity \\
\hline
\end{tabular}
TS EAMCET 03.05.2018
Ray Optics
282037
An object is placed at the principal focus of a convex mirror. The image will be at :
1 centre of curvature
2 principal focus
3 infinity
4 no image will be formed
Explanation:
C: The focus of a convex mirror is behind the mirror. Image is formed only when object is placed infront of mirror. Then image will be formed at infinity.
Karnataka CET-2018
Ray Optics
282040
Consider a light source placed at a distance of $1.5 \mathrm{~m}$ along the axis facing the convex side of a spherical mirror of radius of curvature $1 \mathrm{~m}$. The position (s'), nature and magnification (m) of the image are
282035
An object is placed at a distance of $20 \mathrm{~cm}$ from the pole of a concave mirror of focal length $\mathbf{1 0}$ $\mathrm{cm}$. The distance of the image formed is :
1 $+20 \mathrm{~cm}$
2 $+10 \mathrm{~cm}$
3 $-20 \mathrm{~cm}$
4 $-10 \mathrm{~cm}$
Explanation:
C: Given that, Object distance (u) $=-20 \mathrm{~cm}$ Focal length of mirror $(\mathrm{f})=-10 \mathrm{~cm}$ We know that, From mirror formula,
$\begin{aligned}
\frac{1}{\mathrm{f}}=\frac{1}{\mathrm{u}}+\frac{1}{\mathrm{~V}} \\
-\frac{1}{10}=-\frac{1}{20}+\frac{1}{\mathrm{v}} \\
\frac{1}{\mathrm{v}}=\frac{1}{20}-\frac{1}{10} \\
\frac{1}{\mathrm{v}}=\frac{1-2}{20} \\
\mathrm{v}=-20 \mathrm{~cm}
\end{aligned}$
Karnataka CET-2018
Ray Optics
282036
Match the following diagrams with the correct statement
| List-I| List-II|
|-----|-------|
| (a) | (i) Positive magnification, image on the opposite side of the object |
| (b) | (ii) Positive magnification $m>1$|
| (c) | (iii) Real image|
| (d) | (iv) No image|
1 (a) - (ii),(b) - (i),(c) - (iii),(d) - (iv)
2 (a) - (iii),(b) - (ii),(c) - (iv),(d) - (i)
3 (a) - (ii),(b) - (iii),(c) - (i),(d) - (iv)
4 (a) - (iii),(b) - (i),(c) - (ii),(d) - (iv)
Explanation:
A:
\begin{tabular}{|l|l|l|}
\hline (a) & (ii) Positive magnification \\
\hline (b) & (i) Positive magnification, image on the opposite side of the object. \\
\hline (c) & (iii) Real image form. \\
\hline (d) & (iv) No image i.e. image is formed at the infinity \\
\hline
\end{tabular}
TS EAMCET 03.05.2018
Ray Optics
282037
An object is placed at the principal focus of a convex mirror. The image will be at :
1 centre of curvature
2 principal focus
3 infinity
4 no image will be formed
Explanation:
C: The focus of a convex mirror is behind the mirror. Image is formed only when object is placed infront of mirror. Then image will be formed at infinity.
Karnataka CET-2018
Ray Optics
282040
Consider a light source placed at a distance of $1.5 \mathrm{~m}$ along the axis facing the convex side of a spherical mirror of radius of curvature $1 \mathrm{~m}$. The position (s'), nature and magnification (m) of the image are
| (i) Positive magnification, image on the opposite side of the object |
| (ii) Positive magnification $m>1$|
| (iii) Real image|
| (iv) No image|