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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