282514
The maximum magnification that can be obtained with a convex lens of focal length 2.5 \(\mathbf{c m}\) is least distance of distance vision is \(\mathbf{2 5} \mathbf{~ c m}\)
282345
Focal length of a convex lens will be maximum for
1 blue light
2 yellow light
3 green light
4 red light
Explanation:
D: Red light has maximum wavelength among all of them
So, red light has highest focal length.
Karnataka CET-2022
Ray Optics
282564
A beam of parallel rays is brought to a focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is :
1 the focus shifts to infinity
2 the focal point shifts towards the lens by a small distance
3 the focal point shifts away from the lens by a small distance
4 the focus remains undisturbed
Explanation:
A: We know that,
For combined focal length,
\(\begin{aligned}
\frac{1}{\mathrm{~F}}=\frac{1}{\mathrm{f}_1}+\frac{1}{\mathrm{f}_2} \\
\frac{1}{\mathrm{~F}}=\frac{1}{\mathrm{f}}+\frac{1}{(-\mathrm{f})} \\
\frac{1}{\mathrm{~F}}=0 \\
\mathrm{~F}=\infty
\end{aligned}\)
or
Karnataka CET-2004
Ray Optics
282336
When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction. This is called:
1 Scattering
2 Chromatic aberration
3 Spherical aberration
4 Polariasation
Explanation:
B: A lens will not focus different colours in exactly the same place because the focal length depends on wavelength of individual light, and the wavelength is different for different colours. This is called chromatic aberration.
282514
The maximum magnification that can be obtained with a convex lens of focal length 2.5 \(\mathbf{c m}\) is least distance of distance vision is \(\mathbf{2 5} \mathbf{~ c m}\)
282345
Focal length of a convex lens will be maximum for
1 blue light
2 yellow light
3 green light
4 red light
Explanation:
D: Red light has maximum wavelength among all of them
So, red light has highest focal length.
Karnataka CET-2022
Ray Optics
282564
A beam of parallel rays is brought to a focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is :
1 the focus shifts to infinity
2 the focal point shifts towards the lens by a small distance
3 the focal point shifts away from the lens by a small distance
4 the focus remains undisturbed
Explanation:
A: We know that,
For combined focal length,
\(\begin{aligned}
\frac{1}{\mathrm{~F}}=\frac{1}{\mathrm{f}_1}+\frac{1}{\mathrm{f}_2} \\
\frac{1}{\mathrm{~F}}=\frac{1}{\mathrm{f}}+\frac{1}{(-\mathrm{f})} \\
\frac{1}{\mathrm{~F}}=0 \\
\mathrm{~F}=\infty
\end{aligned}\)
or
Karnataka CET-2004
Ray Optics
282336
When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction. This is called:
1 Scattering
2 Chromatic aberration
3 Spherical aberration
4 Polariasation
Explanation:
B: A lens will not focus different colours in exactly the same place because the focal length depends on wavelength of individual light, and the wavelength is different for different colours. This is called chromatic aberration.
282514
The maximum magnification that can be obtained with a convex lens of focal length 2.5 \(\mathbf{c m}\) is least distance of distance vision is \(\mathbf{2 5} \mathbf{~ c m}\)
282345
Focal length of a convex lens will be maximum for
1 blue light
2 yellow light
3 green light
4 red light
Explanation:
D: Red light has maximum wavelength among all of them
So, red light has highest focal length.
Karnataka CET-2022
Ray Optics
282564
A beam of parallel rays is brought to a focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is :
1 the focus shifts to infinity
2 the focal point shifts towards the lens by a small distance
3 the focal point shifts away from the lens by a small distance
4 the focus remains undisturbed
Explanation:
A: We know that,
For combined focal length,
\(\begin{aligned}
\frac{1}{\mathrm{~F}}=\frac{1}{\mathrm{f}_1}+\frac{1}{\mathrm{f}_2} \\
\frac{1}{\mathrm{~F}}=\frac{1}{\mathrm{f}}+\frac{1}{(-\mathrm{f})} \\
\frac{1}{\mathrm{~F}}=0 \\
\mathrm{~F}=\infty
\end{aligned}\)
or
Karnataka CET-2004
Ray Optics
282336
When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction. This is called:
1 Scattering
2 Chromatic aberration
3 Spherical aberration
4 Polariasation
Explanation:
B: A lens will not focus different colours in exactly the same place because the focal length depends on wavelength of individual light, and the wavelength is different for different colours. This is called chromatic aberration.
282514
The maximum magnification that can be obtained with a convex lens of focal length 2.5 \(\mathbf{c m}\) is least distance of distance vision is \(\mathbf{2 5} \mathbf{~ c m}\)
282345
Focal length of a convex lens will be maximum for
1 blue light
2 yellow light
3 green light
4 red light
Explanation:
D: Red light has maximum wavelength among all of them
So, red light has highest focal length.
Karnataka CET-2022
Ray Optics
282564
A beam of parallel rays is brought to a focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is :
1 the focus shifts to infinity
2 the focal point shifts towards the lens by a small distance
3 the focal point shifts away from the lens by a small distance
4 the focus remains undisturbed
Explanation:
A: We know that,
For combined focal length,
\(\begin{aligned}
\frac{1}{\mathrm{~F}}=\frac{1}{\mathrm{f}_1}+\frac{1}{\mathrm{f}_2} \\
\frac{1}{\mathrm{~F}}=\frac{1}{\mathrm{f}}+\frac{1}{(-\mathrm{f})} \\
\frac{1}{\mathrm{~F}}=0 \\
\mathrm{~F}=\infty
\end{aligned}\)
or
Karnataka CET-2004
Ray Optics
282336
When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction. This is called:
1 Scattering
2 Chromatic aberration
3 Spherical aberration
4 Polariasation
Explanation:
B: A lens will not focus different colours in exactly the same place because the focal length depends on wavelength of individual light, and the wavelength is different for different colours. This is called chromatic aberration.
282514
The maximum magnification that can be obtained with a convex lens of focal length 2.5 \(\mathbf{c m}\) is least distance of distance vision is \(\mathbf{2 5} \mathbf{~ c m}\)
282345
Focal length of a convex lens will be maximum for
1 blue light
2 yellow light
3 green light
4 red light
Explanation:
D: Red light has maximum wavelength among all of them
So, red light has highest focal length.
Karnataka CET-2022
Ray Optics
282564
A beam of parallel rays is brought to a focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is :
1 the focus shifts to infinity
2 the focal point shifts towards the lens by a small distance
3 the focal point shifts away from the lens by a small distance
4 the focus remains undisturbed
Explanation:
A: We know that,
For combined focal length,
\(\begin{aligned}
\frac{1}{\mathrm{~F}}=\frac{1}{\mathrm{f}_1}+\frac{1}{\mathrm{f}_2} \\
\frac{1}{\mathrm{~F}}=\frac{1}{\mathrm{f}}+\frac{1}{(-\mathrm{f})} \\
\frac{1}{\mathrm{~F}}=0 \\
\mathrm{~F}=\infty
\end{aligned}\)
or
Karnataka CET-2004
Ray Optics
282336
When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction. This is called:
1 Scattering
2 Chromatic aberration
3 Spherical aberration
4 Polariasation
Explanation:
B: A lens will not focus different colours in exactly the same place because the focal length depends on wavelength of individual light, and the wavelength is different for different colours. This is called chromatic aberration.
