Physics - Light & Optical Instruments - KBSE

Physics - Light & Optical Instruments - KBSE

1. When a ray of light enters obliquely from a rarer medium enters in a denser medium then the relation between angle of refraction and angle of incidence is:

a) Angle of incidence is smaller than angle of refraction
b) Both are equal to each other
c) Angle of refraction is smaller than the angle of incidence
d) None of these
2. An object 2 cm high is placed in front of a convex lens of focal length 14 cm. find the position of the object if a real image 4 cm high is obtained:

a) 20 cm
b) 21 cm
c) 10 cm
d) 15 cm
3. The power of a convex lens is 10 diopter, where should an object be placed so that a real image of three times of the object is formed:

a) 12.5 cm
b) 125 cm
c) 13.5 cm
d) 13.3 cm
4. When a ray of light enters obliquely from one medium into another if deviates from its original path. The phenomenon is called:

a) Refraction of light
b) Total internal reflection of light
c) Reflection of light
d) Short sightedness
5. In long sightedness the image is formed:

a) At retina
b) Behind the retina
c) In front of retina
d) None of these
6. An object is placed at a distance of 20 cm from a concave lens of focal length 10 cm. If the object height is 6 cm then find the size of image:

a) 2 cm
b) 12 cm
c) 20 cm
d) 10 cm
7. The refractive index of diamond is 2.42 calculate the speed of light it:

a) 3 x 108 m / sec
b) 15 x 105 km / sec
c) 1.24 x 108 m / sec
d) 1.23 x 106 m / sec
8. The eye and the camera are similar because the image formed in both is:

a) Real, inverted and enlarged
b) Virtual, erect and small
c) Real, erect and small
d) Real, inverted and small
9. A single diverging lens is used in:

a) Simple microscope
b) A magnifying glass
c) A camera
d) The correction of short sightedness
10. In compound microscope the focal length of objective is:

a) Larger than the focal length of eye piece
b) Equal to the focal length of eye piece
c) Less than the focal length of eye piece
d) None of these
11. If an object is situated between the optical canter and the principal focus of a convex lens then its image is formed on the same side as the object this image will be:

a) Erect, virtual and large in size
b) Inverted , real and of the same size as that of object
c) Inverted , real and smaller in size
d) Inverted , real and bigger in size
12. The refractive index of water is 1.33, if the depth of water pond is 4m. Calculate the apparent depth of pond if the water level is 3.5m high:

a) 2.63 m
b) 1.5 m
c) 4.65 m
d) 3.75 m
13. For total internal reflection of light the angle of incidence must be:

a) Smaller than critical angle
b) Equal to critical angle
c) Greater than critical angle
d) Half of critical angle
14. A convex lens is:

a) A diverging lens
b) Thinner at the center
c) Thicker at the center
d) Plane through out
15. The pupil of the eye controls:

a) The focal length of the eye
b) The amount of light entering in the eye
c) The range of accommodation of eye
d) The distance of distinct vision
16. The objective of a refracting telescope is a:

a) Double convex lens
b) Convex mirror
c) Plane mirror
d) None of these
17. In a photographic camera a convex lens is used because:

a) Produces a real and smaller image
b) Produces an enlarged image
c) Image equal to the size of object
d) Virtual image
18. Short sightedness can be corrected by using:

a) Concave lens
b) Convex lens
c) Plano convex lens
d) Both concave and convex lenses
19. An object is placed at a distance of 15 cm from a convex lens of focal length 10 cm, the magnification produced by the lens will be:

a) Four times
b) Two times
c) Six times
d) None of these
20. The radius of curvature of a concave mirror is 20 cm. its focal length will be:

a) 20 cm
b) 15 cm
c) 10 cm
d) 30 cm
 
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