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1. Which mirror is used in solar furnaces?
A. Convex mirror
B. Concave mirror
C. Plane mirror
D. Cylindrical mirror
2. In refraction from denser to rarer medium, light bends
A. Towards normal
B. Away from normal
C. Without deviation
D. Parallel to normal
3. A ray passing through the optical centre of a lens
A. Gets deviated
B. Emerges undeviated
C. Bends towards axis
D. Bends away from axis
4. The image formed by a convex lens when object is at infinity is
A. Real and inverted at F
B. Virtual and erect at O
C. Same size at 2F
D. Enlarged at infinity
5. Which of these always forms diminished images?
A. Concave mirror
B. Convex mirror
C. Convex lens
D. Plane mirror
6. A ray parallel to the principal axis of a concave mirror passes through
A. Pole
B. Focus
C. Centre of curvature
D. Infinity
7. The distance from pole to focus of a mirror is called
A. Aperture
B. Radius of curvature
C. Focal length
D. Magnification
8. The SI unit of focal length is
A. Metre
B. Centimetre
C. Dioptre
D. Hertz
9. A ray passing through centre of curvature of a concave mirror
A. Emerges parallel
B. Retraces its path
C. Passes through focus
D. Deviates
11. A concave lens always produces images that are
A. Virtual, erect and diminished
B. Real, inverted and diminished
C. Virtual, erect and same size
D. Real, inverted and enlarged
12. The power of a lens is defined as
A. f/1
B. 1/f
C. f²
D. v/u
14. The image formed by a convex mirror of a distant object is located
A. At focus in front
B. At focus behind
C. At infinity
D. At 2F
15. Which lens is used in spectacles for correcting short-sightedness (myopia)?
A. Convex lens
B. Concave lens
C. Cylindrical lens
D. Plano lens
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