Thin Lens Formula and Lens Maker Formula NEET Questions

Physics - Optics

Thin Lens Formula and Lens Maker Formula MCQ Questions


13.
A convex lens of focal length 30 cm is placed in air. What is its power?
A.
+3.33D
B.
+4D
C.
-3D
D.
+6D
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ANSWER :
A. +3.33D
14.
What is the formula for magnification (m) in a lens?
A.
m = v/u
B.
m = u/v
C.
m = -v/u
D.
m = -u/v
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ANSWER :
C. m = -v/u
15.
In the thin lens formula, what does ā€˜vā€™ represent?
A.
Image distance
B.
Object distance
C.
Focal length
D.
Refractive index
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ANSWER :
A. Image distance
16.
What happens to the power of a lens if it is immersed in a medium of higher refractive index?
A.
It increases
B.
It decreases
C.
Remains unchanged
D.
Becomes zero
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ANSWER :
B. It decreases
17.
What happens to the focal length of a convex lens when its medium changes from air to water?

NEET - 2023

A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the shape
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ANSWER :
A. Increases
18.
If two convex lenses of focal lengths 20 cm and 30 cm are combined, what is the equivalent focal length?
A.
12 cm
B.
50 cm
C.
60 cm
D.
None of these
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ANSWER :
A. 12 cm