Thin Lens Formula and Lens Maker Formula NEET Questions

Physics - Optics

Thin Lens Formula and Lens Maker Formula MCQ Questions


1.
What is the focal length of a plane glass sheet?
A.
Zero
B.
Infinite
C.
50 cm
D.
10 cm
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ANSWER :
B. Infinite
2.
A convex lens forms a real and inverted image when the object is placed:
A.
At infinity
B.
Between f and 2f
C.
Beyond 2f
D.
Between f and the lens
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ANSWER :
B. Between f and 2f
3.
The power of a convex lens is +5D. What is its focal length?
A.
0.2 m
B.
5 m
C.
20 cm
D.
0.5 m
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ANSWER :
A. 0.2 m
4.
Which of the following is true for a concave lens?
A.
It always forms real images
B.
It always forms virtual images
C.
It forms only magnified images
D.
It never forms an inverted image
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ANSWER :
B. It always forms virtual images
5.
The unit of lens power is:
A.
Diopter
B.
Joule
C.
Newton
D.
Watt
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ANSWER :
A. Diopter
6.
For a convex lens, if the object is placed at infinity, the image formed is:

NEET - 2017

A.
At infinity
B.
At the focus
C.
Between the focus and center of curvature
D.
At twice the focal length
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ANSWER :
B. At the focus