Physics Questions asked from lesson "Reflection of light at curved surfaces" in POLYCET previous years entrance tests of years 2015 to 2020

1. If an object is placed between the focus (F) and the centre of curvature (c) on the Principal axis of a concave mirror , then the position of the image is

1. Behind the mirror
2. At infinity
3. Between F and C
4. Beyond C

2. If u , v , and f are the object distance, image distance and focal length respectively,  then the mirror formula is given by

1. f= 1/u + 1/v
2. 1/f = u+v
3. 1/f = 1/u+1/v
4. 1/2f = 1/u + 1/v

3.  An image is formed at a distance of 30cm 

1. 2 cm
2. 15 cm
3. 30 cm
4. 45 cm

4. An object is placed between pole and focus of a concave mirror.  The nature of the image is 

1. Real, inverted and diminished
2. Real, inverted and same size 
3. Virtual,  erect and enlarged
4. Virtual,  erect and diminished 

5.which of the following relations is correct in general for spherical mirrors with object distance u, image distance v and focal length f ?

1. -1/f = 1/u+1/v
2. 1/f = 1/u+1/v
3. 1/f = 1/u×1/v
4. 1/f×1/u = 1/v

6. When parallel rays are incident on a concave mirror,  at what point do they meet after reflection ?

1. Center of curvature 
2. Focus 
3. Pole
4. Infinity 

7. An object is placed at a distance of 30 cm in front of a concave mirror of focal length 20cm. The image is formed at a distance of 

1. 60 cm
2. -60 cm
3. 30 cm
4. -30 cm

8.  Which of the following is true in case of Virtual image ?

1. Always erect 
2. Always inverted 
3. Obtained on screen 
4. None of the above 

9. A light ray incidents on a plane mirror At an angle 33⁰. Then whatbis the angle of reflection ?

1. 66⁰
2. 33⁰
3. 22⁰
4. 11⁰

10. A spherical mirror whose reflecting surface curved upwards is 

1. Convex mirror
2. Concave mirror 
3. Plane mirror 
4. All of the above 

11. Parallel rays incident on a concave mirror, on reflection meet at what point ?

1.  At pole
2. At focal point 
3. At centre of curvature 
4. Any where

12. If 'R' is a radius of curvature of mirror and 'f' is a focal length , which of the following relation is correct ?

1. R = f
2. 2R = f
3. R+ 2f = 0
4. R- 2f = 0

13. A straight line passes through the centre of curvature and pole of the Convex mirror is called __________

1. Parallel axis
2. Perpendicular axis
3. Principal axis
4. None

14. Diminished image is formed with a concave mirror when the object is placed 

1. At focus
2. At centre of curvature 
3. Between pole and focus 
4. Beyond centre of curvature 

15. The mirror used by dentist is

1. Convex
2. Plane
3. Concave 
4. None

16. The size of the image formed by a Convex mirror is always

1. Enlarged 
2. Diminished 
3. Equal to the size of the object 
4. None

17. The mirror used as "Rear view" mirror in vehicles is

1. Concave 
2. Convex 
3. Plane 
4. None of the above 

18. The minimum distance from a real object to the real image in a concave mirror is equal to

1. 2F
2. F
3. 0
4. F/2

19. The relation between focal length and radius of curvature of a spherical mirror is 

1. f = R/2
2. f = 2R
3. R = f
4. R = 3f

20. Which of the following I a formula for magnification of spherical mirror 

a) v/u

b) -v/u

C) hi/ho

d) ho/hi

1. a and b
2. b and c
3. c and d
4. d and a