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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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Slows down
Reflects back
Does not change speed
Speeds up
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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Both A and R are true, and R is the correct explanation.
Both A and R are true, but R is not the correct explanation.
A is false, R is true.
A is true, R is false.
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
Wavelength in vacuum / wavelength in medium
Speed of light in medium / speed of light in vacuum
Frequency in vacuum / frequency in medium
Q5. Which of the following is true about light entering a denser medium?
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Its frequency increases
It travels faster
It bends away from the normal
It bends towards the normal
Q6. The path of light bends towards the normal when it goes from:
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Water to air
Air to vacuum
Glass 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
Plane lens
Diverging lens
Concave lens
Q8.
A concave lens always forms an image that is:
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Real and inverted
Virtual, erect, and diminished
Virtual and magnified
Real and erect
Q9. The principal focus of a convex lens is the point where:
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Parallel rays converge
All rays reflect
Rays appear to diverge
Diverging rays meet
10. In a concave lens, the image formed is:
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On the other side
At infinity
Beyond 2F
On the same side as the object
Q11.
The focal length of a concave lens is always:
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Negative
Positive
Zero
Infinite
Q12.
What type of image is formed by a convex lens when the object is at 2F?
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Real and diminished
Virtual and magnified
Virtual and upright
Real, same size, inverted
Q13.
Power of a lens is measured in:
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Diopter
Meter
Watt
Candela
Q14.
A ray passing through the optical centre of a lens:
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Passes undeviated
Refracts at 90°
Gets reflected
Bends toward axis
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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