Reflection and Refraction, Spherical Mirrors and Lenses NDA Questions

NDA Physics

Reflection and Refraction, Spherical Mirrors and Lenses MCQ Questions


1.
What type of image is formed by a convex lens when the object is placed beyond the focal point?
A.
Real and inverted
B.
Real and erect
C.
Virtual and inverted
D.
Virtual and erect
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ANSWER :
C. Virtual and inverted
2.
What is the unit of measurement for the power of a lens?
A.
Dioptre
B.
Watt
C.
Newton
D.
Joule
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ANSWER :
A. Dioptre
3.
Which of the following is NOT a type of lens?
A.
Convex lens
B.
Concave lens
C.
Diverging lens
D.
Reflecting lens
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ANSWER :
D. Reflecting lens
4.
What is the focal point of a concave mirror?
A.
The point where parallel rays of light converge
B.
The point where diverging rays of light converge
C.
The point where parallel rays of light diverge
D.
None of the above
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ANSWER :
A. The point where parallel rays of light converge
5.
Which law of physics describes the relationship between the angle of incidence and the angle of reflection?
A.
Snell's law
B.
Ohm's law
C.
Newton's first law of motion
D.
Law of reflection
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ANSWER :
D. Law of reflection
6.
What happens to the speed of light when it travels from air into glass?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the Wavelength
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ANSWER :
B. Decreases