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Power of plane glass is
1. one
2. zero
3. -one
4. none of these
a short pulse of white light is incident from air to to a glass slab to normal icidence. after travelling through the slab, the first colour emerge is:
1. violet
2. green
3. red
4. none of these
the branch of physics for measurement of light energy is
1. barometer
2. photometry
3. bolometer
4. none of these
type of images formed by convex mirror is:
1. errect image
2. virtual image
3. upside down
4. none of these
when object is placed at focus of concave lens. where will the image form
1. real image at infinity
2. real image at focus
3. virtual image at infinity
4. none of these
which mirror is used s rear view mirrors in cars
1. convex lens
2. concave
3. convex
4. none of these
law of reflection states:
1. angle of incident= angle of reflection
2. incident ray, normay ray lie in same plane
3. both A and B
4. NONE OF THESE
if a ray of incident on a plane mirror at angle of incident i, how much will be the deviation
1. pi - 2i
2. pi + 2 i
3. pi + 3i
4. none of these
the shortest height of a vertical mirror required to see the entire image of a man will be
1. same as man's height
2. double the man's height
3. half the man's height
4. noine of these
the magnification of astronomical telescope is 10 and the focal length of eye piece is 20cm . The focal lenth of objective lens is:
1. 100cm
2. 200cm
3. 1200cm
4. 2cm
brilliance of diamond is due to
1. sharp
2. reflection
3. cutting
4. total internal reflection
golden view of seashell is due to
1. polarisation
2. diffraction
3. dispersion
4. reflection
an endoscope is employed by a physician to view the internal parts of a body organ. it is based on the principle of:
1. refraction
2. reflection
3. total internal reflection
4. dispersion
the radius of convex surface of the plano-convex lens is 20cm and then refractive index of material of lens is 1.5 . the focal length is:
1. 20cm
2. 30cm
3. 40cm
4. 50cm
in the given figure , find the angle of prism
1. A
2. B
3. C
4. D
What should be the minimum value of refractive index of material of prism for the reflection to take place as shown
1. 1.7
2. 1.4
3. 2.7
4. 1.2
the deviation is maximum in which colour
1. red
2. green
3. violet
4. blue
a plane glass slab is kept over various colours letters, the letter which appears least raised is:
1. red
2. violet
3. green
4. blue
a plane mirror produces a magnification of
1. zero
2. +1
3. -1
4. between o and +1
a person use spectical of power +2D. He is suffering from
1. myopia
2. presbyopia
3. astigmatism
4. hypermetropia
whwn light passes through a prism the deviation is maximum for
1. violet light
2. green light
3. yellow light
4. red light
In optical fibres, the refractive index of the core is
1. greater than that of the cladding.
2. equal to that of the cladding.
3. smaller than that of the cladding.
4. independent of that of cladding.
Air bubble in water behaves as
1. sometimes concave, sometimes convex lens
2. concave lens
3. convex lens
4. always refracting surface
A convex lens and a concave lens, each having the same focal length of 25 cm, are put in contact to form a combination of lenses. The power of the combination (in dioptres) is
1. 0
2. 25
3. 50
4. infinty
When a ray of light enters from one medium to another, then which of the following does not change?
1. frequency
2. wavelenght
3. speed
4. amplitude
For a sine wave, the frequency is represented by the cycles per
1. second
2. minutes
3. hour
4. none of these
What is the typical value of refractive index for an ethyl alcohol
1. 1
2. 1.36
3. 2
4. 2.4

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