CDS Physics
Optics — Quiz
20 Questions · No Negative Marking
Question 1
The speed of light in vacuum is:
A3 × 10⁶ m/s
B3 × 10⁸ m/s
C3 × 10¹⁰ m/s
D3 × 10⁵ km/s
Question 2
The focal length of a concave mirror is:
APositive
BNegative (by sign convention)
CZero
DInfinite
Question 3
Total internal reflection occurs when light travels from:
ARarer to denser medium at any angle
BDenser to rarer medium at angle greater than critical angle
CDenser to rarer medium at any angle
DRarer to denser medium at angle greater than 45°
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