Name the type of mirrors used in the design of solar furnaces. Explain how high temperature is achieved by this device.
CBSE OUTSIDE DELHI - SET 1 2016
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Concave Mirrors/Converging Mirrors.
When a solar furnace is placed at the focus of a large concave mirror/reflector, it focuses a parallel beam of light on the furnace, consequently a high temperature is achieved after some time.
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The refractive indices of three media are given below :
Medium
Refractive Index
A
1.6
B
1.8
C
1.5
A ray of light is travelling from $A$ to $B$ and another ray is travelling from $B$ to $C$. (a) In which of the two cases the refracted ray bends towards the normal? (b) In which case does the speed of light increase in the second medium? Give reasons for your answer.