Ray optics mcq

Ray optics mcq

1. The speed of light is_______ in vacuum.
   
   
   
   1. 3 x 10⁵ m/s 
   2. 3 x 10⁸ m/s 
   3. 3 x 10⁸ km/s 
   4. 3 x 10⁶ m/s 
2. The wavelength of the visible light is ________.
   
   
   
   1. 4 x 10^(-7) to 8 x 10^(-7) m 
   2. 4 x 10⁷ to 8 x 10⁷ m 
   3. 4 x 10^(-7) to 8 x 10^(-7) Å 
   4. 4 x 10⁷ to 8 x 10⁷ Å 
3. We can see objects because of_______
   
   
   
   1. reflection 
   2. refraction 
   3. transmission 
   4. diffraction
4. The image formed by a convex mirror is always________
   
   
   
   1. real 
   2. enlarged
   3. virtual and enlarged 
   4. diminished
5. As you move an object away from a convex mirror, its image becomes_____ and moves towards______
   
   
   
   1. smaller, infinity 
   2. smaller, focus
   3. enlarged, infinity 
   4. enlarged, focus
6. For a spherical mirror, ______ is true.
   
   
   
   1. f = 2R 
   2. R = 2f
   3. fR = 2 
   4. fR = 1/2
7. The mirror formula is ________.
   
   
   
   1. 1/u - 1/v = 1/f 
   2. 1/f + 1/u = 1/v
   3. f = uv/(u+v) 
   4. f = (u+v)/uv
8. For a plane mirror, magnification (m)=________
   
   
   
   1. 0 
   2. 1
   3. ± 1 
   4. ≤ 0
9. Magnification for convex mirror is ________.
   
   
   
   1. always positive 
   2. always negative
   3. sometimes positive 
   4. 1
10. The image formed by a concave lens is ________.
    
    
    
    1. always real and enlarged 
    2. always real and diminished
    3. always virtual and enlarged 
    4. always virtual and diminished
11. The lens formula is ________.
    
    
    
    1. 1/f = 1/u + 1/v 
    2. 1/f = 1/u - 1/v
    3. 1/f = 1/v - 1/u 
    4. 1/f + 1/v = u
12. 1 diopter = ________.
    
    
    
    1. 1 m 
    2. 1 m^(-1)
    3. 1 cm 
    4. 1 cm^(-1)
13. Which of the following is a true statement?
    
    
    
    1. The power of a lens is always positive. 
    2. The power of a lens is always negative.
    3. The power of a convex lens is positive. 
    4. The power of a concave lens is positive.
14. Image formed by a concave mirror is erect and enlarged.What is the position of the object?
    
    
    
    1. Between focus F and the center of curvature 
    2. At the center of curvature
    3. Beyond the center of curvature 
    4. Between pole and the focus
15. If the focal length of a spherical mirror is 40 cm, then its radius of curvature is _______ cm.
    
    
    
    1. 80 
    2. 20
    3. 10 
    4. 5
16. The velocity of light in vacuum is _______ ms^(-1)
    
    
    
    1. 3 x 10⁶ 
    2. 3 x 10⁸
    3. 3 x 10 ¹² 
    4. 3 x 10¹⁵
17. If the angle of incidence, θ_i = 0°, the angle of reflection, θ_r = ________.
    
    
    
    1. 0° 
    2. 90°
    3. 180° 
    4. 45°
18. No matter how far is the object from the mirror, the image of the object appears erect. The mirror is ________.
    
    
    
    1. concave 
    2. convex
    3. either concave or convex 
    4. none of these
19. A boy is standing at a distance of 2 m in front of a plane mirror.The distance between the boy and his image is ________ m.
    
    
    
    1. 4 
    2. 3
    3. 2 
    4. 1
20. The image formed by a concave mirror is real, inverted and of the same size as that of the object.The position of the object should be ________.
    
    
    
    1. beyond the center of curvature of mirror 
    2. between the center of curvature and the focus
    3. at the center of curvature of the mirror 
    4. at the focus
21. Which of the following has the highest refractive index?
    
    
    
    1. Glass 
    2. Water
    3. Pearl 
    4. Diamond
22. Absolute refractive index of any medium is always _______.
    
    
    
    1. 1 
    2. > 1
    3. < 1 
    4. 0
23. The image formed by a plane mirror is ______.
    
    
    
    1. real 
    2. diminished
    3. enlarged 
    4. laterally inverted
24. The incident ray passing through the focus(F) of a mirror ______ after reflection.
    
    
    
    1. passes through C 
    2. passes through F
    3. becomes parallel to the principal axis 
    4. passes through the pole
25. The incident ray passing through the center of curvature(C) of a mirror ______ after reflection.
    
    
    
    1. passes through C 
    2. passes through F
    3. passes through the pole 
    4. becomes parallel to the principal axis
26. The incident ray parallel to the principal axis of a mirror ______ after reflection.
    
    
    
    1. passes through C 
    2. passes through F
    3. passes through the pole 
    4. reverts back in the opposite direction
27. According to the sign convention, the distance of object...
    
    
    
    1. is always positive 
    2. is always negative
    3. may be positive or negative 
    4. is equal to object height
28. According to the sign convention, the distance of image...
    
    
    
    1. is always positive 
    2. is always negative
    3. may be positive or negative 
    4. is equal to image height
29. The refractive index of a denser medium with respect to a rarer medium is...
    
    
    
    1. 1 
    2. greater than 1
    3. smaller than 1 
    4. negative
30. The refractive index of a rarer medium with respect to a denser medium is...
    
    
    
    1. 1 
    2. greater than 1
    3. smaller than 1 
    4. negative
31. Total internal reflection will occur if the angle of reflection is...
    
    
    
    1. 45° 
    2. 60°
    3. 90° 
    4. 99°
32. Magnification for ______ image is always ______.
    
    
    
    1. real, positive 
    2. real, negative
    3. virtual, negative 
    4. any, negative
33. If magnification is +1.5, the image is______.
    
    
    
    1. erect
    2. diminished
    3. real
    4. inverted

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