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LIGHT : REFLECTION AND REFRACTION - II
PREPARED BY: P NAGESWARA RAO, M.SC., B.Ed.,
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Q1.
What is the change in direction of light called when it passes from one medium to another?
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1 point
Your answer
Q2.
When light travels from air into glass, it:
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Speeds up
Slows down
Does not change speed
Reflects back
Q3.
Assertion:
Light bends towards the normal when it enters a denser medium.
Reason:
Speed of light increases in a denser medium.
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A is true, R is false.
Both A and R are true, but R is not the correct explanation.
A is false, R is true.
Both A and R are true, and R is the correct explanation.
Q4. Refractive index of a medium is given by the ratio:
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Speed of light in vacuum / speed of light in medium
Frequency in vacuum / frequency in medium
Wavelength in vacuum / wavelength in medium
Speed of light in medium / speed of light in vacuum
Q5. Which of the following is true about light entering a denser medium?
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It travels faster
It bends towards the normal
It bends away from the normal
Its frequency increases
Q6. The path of light bends towards the normal when it goes from:
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Glass to air
Air to vacuum
Water to air
Air to water
Q7.
A lens that is thicker at the center than at the edges is called a:
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Convex lens
Concave lens
Plane lens
Diverging lens
Q8.
A concave lens always forms an image that is:
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Real and erect
Virtual, erect, and diminished
Virtual and magnified
Real and inverted
Q9. The principal focus of a convex lens is the point where:
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Diverging rays meet
All rays reflect
Rays appear to diverge
Parallel rays converge
10. In a concave lens, the image formed is:
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Beyond 2F
On the same side as the object
At infinity
On the other side
Q11.
The focal length of a concave lens is always:
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Infinite
Zero
Positive
Negative
Q12.
What type of image is formed by a convex lens when the object is at 2F?
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Real, same size, inverted
Real and diminished
Virtual and upright
Virtual and magnified
Q13.
Power of a lens is measured in:
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Watt
Meter
Candela
Diopter
Q14.
A ray passing through the optical centre of a lens:
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Bends toward axis
Refracts at 90°
Passes undeviated
Gets reflected
Q15.
Power of a convex lens of focal length 50 cm is:
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–2 D
+1.5 D
+0.5 D
+2 D
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