Question

Multiple choice questions

1. An object at a distance of 15 cm is slowly moved towards the pole of a

convex mirror. The image will get ________.

(A) short and real (C) enlarge and virtual

(B) enlarged and real (D) diminished and virtual

2. A concave mirror of focal length 20 cm forms an image having twice the

size of object. For the virtual position of object, the position of object will

be at _____.

(A) -25 cm (B) -40 cm (C) -10 cm (D) at infinity

3. As light travels from a rarer to a denser medium it will have _______.

(A) increased velocity (C) constant velocity

(B) decreased velocity (D) none of these

4. A divergent lens will produce __________

(A) always real image (C) both real and virtual image

(B) always virtual image (D) enlarge and virtual image.

5. A magnified real image is formed by a convex lens when the object is at

_________.

(A) F (B) beyond 2F (C)between F and 2F (D) at infinity

6. A full length image of a distant tall building can definitely be seen by

using _______.

(A) a concave mirror (B) a convex mirror (C) a plane mirror (D) both (a),( c)

7. Find the focal length of a lens of power -2.0 D

(A) -5 cm (B) -5 m (C) -50 cm (D) -50 cm

8. What is the angle of refraction for a light ray incident normal to the

surface of a medium?

(A) 900

(B) 600

(C) 300

(D) zero

9. Magnification produced by a rear – view mirror fitted in vehicles ______.

(A) is always less than 1 (C) is always more than 1

(B) is always equal to 1 (D) none of these

10. A ray of light travelling in air is obliquely incident on undisturbed

horizontal surface of pond water. Inside the water it ________.

(A) will travel without deviation

(B) will bend away from the normal drawn at the point of incidence.

(C) will bend towards the normal drawn at the point of incidence.

(D)will turn back following the original path.​

Answer 1

the answer of 1 is option D diminished and virtual .

Answer 2

Explanation:

1. (d) virtual and diminished.

2.(c) -10 cm.

3.(b) decreased velocity.

4.(b) always virtual image.

5.(a) F.

6.(b) a convex mirror.

7.(d) -50 cm.

8.(d) zero.

9.(a) is always less than 1 .

10.(b) will bend away from the normal drawn at the point of incidence.