Spherical Surface and Lenses, Lens Formula, Magnification, Combination of Lens.
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
Ray Optics

282441 Which of the following is the correct lens formula?

1 1 V1u=1f
2 1 V+1u=1f
3 vu=f
4 v+u=f
Ray Optics

282442 Two lenses of focal length 100 cm and 8 cm; one convex and other concave are placed on the same optic axis at a separation of 90 cm, as shown in figure. An object O is placed at a distance 50 cm from the convex lens. Find the magnification of the two lens system.
![original image](https://cdn.mathpix.com/snip/images/SFlMgKAN6CwKMiKUiAubOtf-R21yq311TqdgVJYn-AM.original.fullsize.png)

1 0.08
2 0.04
3 0.02
4 0.01
Ray Optics

282443 Assertion: When a convex lens (μg=3/2) of focal length f is dipped in water, its focal length becomes 43f.
Reason: The focal length of convex lens in water becomes 3f.

1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
Ray Optics

282440 A candle placed 25 cm from a lens forms an image on a screen placed 75 cm on the other side of the lens. The focal length and type of the lens should be :

1 +18.75 and convex lens
2 -18.75 and convex lens
3 +20.25 cm and convex lens
4 20.25 cm and convex lens
Ray Optics

282441 Which of the following is the correct lens formula?

1 1 V1u=1f
2 1 V+1u=1f
3 vu=f
4 v+u=f
Ray Optics

282442 Two lenses of focal length 100 cm and 8 cm; one convex and other concave are placed on the same optic axis at a separation of 90 cm, as shown in figure. An object O is placed at a distance 50 cm from the convex lens. Find the magnification of the two lens system.
![original image](https://cdn.mathpix.com/snip/images/SFlMgKAN6CwKMiKUiAubOtf-R21yq311TqdgVJYn-AM.original.fullsize.png)

1 0.08
2 0.04
3 0.02
4 0.01
Ray Optics

282443 Assertion: When a convex lens (μg=3/2) of focal length f is dipped in water, its focal length becomes 43f.
Reason: The focal length of convex lens in water becomes 3f.

1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
Ray Optics

282440 A candle placed 25 cm from a lens forms an image on a screen placed 75 cm on the other side of the lens. The focal length and type of the lens should be :

1 +18.75 and convex lens
2 -18.75 and convex lens
3 +20.25 cm and convex lens
4 20.25 cm and convex lens
Ray Optics

282441 Which of the following is the correct lens formula?

1 1 V1u=1f
2 1 V+1u=1f
3 vu=f
4 v+u=f
Ray Optics

282442 Two lenses of focal length 100 cm and 8 cm; one convex and other concave are placed on the same optic axis at a separation of 90 cm, as shown in figure. An object O is placed at a distance 50 cm from the convex lens. Find the magnification of the two lens system.
![original image](https://cdn.mathpix.com/snip/images/SFlMgKAN6CwKMiKUiAubOtf-R21yq311TqdgVJYn-AM.original.fullsize.png)

1 0.08
2 0.04
3 0.02
4 0.01
Ray Optics

282443 Assertion: When a convex lens (μg=3/2) of focal length f is dipped in water, its focal length becomes 43f.
Reason: The focal length of convex lens in water becomes 3f.

1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
Ray Optics

282440 A candle placed 25 cm from a lens forms an image on a screen placed 75 cm on the other side of the lens. The focal length and type of the lens should be :

1 +18.75 and convex lens
2 -18.75 and convex lens
3 +20.25 cm and convex lens
4 20.25 cm and convex lens
Ray Optics

282441 Which of the following is the correct lens formula?

1 1 V1u=1f
2 1 V+1u=1f
3 vu=f
4 v+u=f
Ray Optics

282442 Two lenses of focal length 100 cm and 8 cm; one convex and other concave are placed on the same optic axis at a separation of 90 cm, as shown in figure. An object O is placed at a distance 50 cm from the convex lens. Find the magnification of the two lens system.
![original image](https://cdn.mathpix.com/snip/images/SFlMgKAN6CwKMiKUiAubOtf-R21yq311TqdgVJYn-AM.original.fullsize.png)

1 0.08
2 0.04
3 0.02
4 0.01
Ray Optics

282443 Assertion: When a convex lens (μg=3/2) of focal length f is dipped in water, its focal length becomes 43f.
Reason: The focal length of convex lens in water becomes 3f.

1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect