Physics Important MCQ for class 10

1. Which of the following can make a parallel beam of light when

light from a point source is incident on it?

(a) Concave mirror as well as convex lens

(b) Convex mirror as well as concave lens

(c) Two plane mirrors placed at 90° to each other

(d) Concave mirror as well as concave lens

2 .A 10 mm long awl pin is placed vertically in front of a concave

mirror. A 5 mm long image of the awl pin is formed at 30 cm in

front of the mirror. The focal length of this mirror is

(a) – 30 cm (b) – 20 cm

(c) – 40 cm (d) – 60 cm

3.Under which of the following conditions a concave mirror can form

an image larger than the actual object?

(a) When the object is kept at a distance equal to its radius of curvature

(b) When object is kept at a distance less than its focal length

(c) When object is placed between the focus and centre of curvature

(d) When object is kept at a distance greater than its radius of

curvature

4. The given figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is:

(a) √3/√2

(b) √2/√3.

(c) 1/√2

(d) √2

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