Q.1
What is the relationship between angle of incidence and angle of refraction for a given pair of media ?
  • δ + A = i1 + i2
  • δ = (i1 + i2) - (r1 + r2)
  • μ = sin i / sin r
  • μ = c / v
Q.2
Relation between wavelength and refractive index.
  • μviolet > μred
  • μviolet < μred
  • μviolet = μred
  • μ has no relation with λ
Q.3
A convex lens of focal lengthcm is in contact with a concave lens of focal lengthcm. the power of the combination is : ______
  • - 1.5 D
  • -6.5 D
  • + 6.5 D
  • + 6,67 D
Q.4
True or False:We see colors because those colors are reflected back to our eyes.
  • True
  • False
Q.5
You have cool glow-in-the-dark stickers of Mickey Mouse. This is an example of
  • fluorescence
  • chemiluminescence
  • phosphorescence
  • incandescence
Q.6
How does light travel?
  • in all directions
  • in transverse waves
  • in a zig zag line
  • back and forth
Q.7
Mirage is a phenomenon due to:
  • Refraction of light
  • Reflection of light
  • Total internal reflection of light
  • Diffraction of light
Q.8
Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted. Which of the following is not correct.
  • The apparent depth of the points close to the edge are nearer the surface of the water compared to the points away from the edge.
  • The angle subtended by the image of the object at the eye is smaller than the actual angle subtended by the object in air.
  • Some of the points of the object far away from the edge may not be visible because of total internal reflection.
  • Water in a trough acts as a lens and magnifies the object.
Q.9
Critical angle and refractive index are:
  • Directly related
  • Equal
  • Inversely related
  • None of these
Q.10
A point source of light is placed in front of a plane mirror.
  • All the reflected rays meet at a point when produced backward.
  • Only the reflected rays close to the normal meet at a point when produced backward
  • Only the reflected rays making a small angle with the mirror, meet at a point when produced backward
  • Light of different colours make different images
Q.11
Mark the correct options:
  • If the incident rays are converging, we have a real object.
  • If the final rays are converging, we have a real image.
  • The image of a virtual object is called a virtual image.
  • If the image is virtual, the corresponding object is called a virtual object.
Q.12
An object is placed at a distance of 0.5 m in front of a plane mirror. The distance between object and image will be:
  • 0.25 m
  • 0.5 m
  • 1.0 m
  • 2.0 m
Q.13
For a total internal reflection, which of the following is correct?
  • Light travels from rarer to denser medium.
  • Light travels from denser to rarer medium.
  • Light travels in air only.
  • Light travels in water only.
Q.14
Concave mirrors will produce...
  • Real, erect images
  • Virtual, inverted images
  • Real, inverted images
  • no images form
Q.15
If a candle is placed atin front of a converging lens, the image
  • will appear at f on the opposite side of the lens
  • the image will appear at 2f on the opposite side of the lens
  • the image will appear between f and 2f on the opposite side of the lens
  • the image will not appear
Q.16
Stimulated emission by recombination of injected carriers is encouraged in
  • Semiconductor injection laser
  • Gas laser
  • Chemist laser
  • Dye laser
Q.17
The macroscopic bending losses show an exponential increase due to ________ in radius of curvature.
  • Increase
  • Decrease
  • Stability
  • None of the above
Q.18
Polarizing angle for Water is?(μ =4/3)
  • 53°53^{\degree}53° 8'
  • 53°53^{\degree}53°
  • 48°48^{\degree}48°
  • 50°50\degree50°
Q.19
The intensity of light is related to its brightness.
  • True
  • False
Q.20
Through what kind of matter does light move fastest?
  • liquids
  • air
  • matter that is lighter in color
  • matter that is in larger objects
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