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Class-7,Light
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Q1) Convex lens focus a real, point sized image at focus, the object is placed
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1 point
Between F and 2F
At 2F
At infinity
At focus
Q2) Bouncing back of light in same medium is called
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1 point
Retardation
Rarefaction
Reflection
Refraction
Q3) The radius of curvature of a mirror is 20cm the focal length is
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1 point
40cm
10cm
20cm
5cm
Q4) 40cmB10cmC20cmD5cm
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1 point
Bralle
Braille
Brallie
Brialle
Q5) Concave mirror is used in head light of vehicle as
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It forms the strong beam of light
It can be easily cleaned
It is easy to use
It reflect the parallel beam of light
Q6) Shaving mirror are usually
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1 point
Biconcave
Convex
Concave
Plane
Q7) The amount of light that is reflected depends on:
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1 point
the nature of the surface
the length of the surface
the material of the surface
the material of the surface and the nature of the surface
Q8) Form of energy that gives us the sensation of sight is:
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1 point
dispersion
light
refraction
reflection
Q9) Concave lens is also known as
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1 point
Diverging lens
Bifocal length
Converging lens
Biconcave lens
Q10) What will be the angle of incidence if a ray of light is reflected back at an angle of 30:
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1 point
60
15
75
30
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