NEET Physics
Lens Makers Formula
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Consistency: 20%
Weightage: 4 / 20 Yrs
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2023 1
2019 1
2013 1
2012 Questions 4 MCQs
01
PYQ 2012
easy
physics ID: neet-201
When a biconvex lens of glass having a refractive index of is dipped in a liquid, it acts as a plane sheet of glass. The liquid must have a refractive index:
| 1. | equal to that of glass. |
| 2. | less than one. |
| 3. | greater than that of glass. |
| 4. | less than that of glass. |
1
(1)
2
(2)
3
(3)
4
(4)
02
PYQ 2013
easy
physics ID: neet-201
A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices and and is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is:
| 1. | 2. | ||
| 3. | 4. |
1
(1)
2
(2)
3
(3)
4
(4)
03
PYQ 2019
medium
physics ID: neet-201
Two similar thin equi-convex lenses, of focal length each, are kept coaxially in contact with each other such that the focal length of the combination is . When the space between the two lenses is filled with glycerin which has the same refractive index as that of glass then the equivalent focal length is . The ratio will be:
| 1. | 2. | ||
| 3. | 4. |
1
(1)
2
(2)
3
(3)
4
(4)
04
PYQ 2023
medium
physics ID: neet-202
In the figure shown here, what is the equivalent focal length of the combination of lenses?
(Assume that all layers are thin)
(Assume that all layers are thin)
| 1. | 2. | ||
| 3. | 4. |
1
(1)
2
(2)
3
(3)
4
(4)