Question
List some things that convex lens and concave mirror have in common.

Answer

Both, convex lens and concave mirror, converge parallel rays of light coming from infinity (parallel to the principal axis) at the focus.

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Similar questions

The following table gives the refractive indices of a few media,
1
2
3
4
5
Medium:
Water
Crown glass
Rock salt
Ruby
Diamond
Refractive index:
1.33
1.52
1.54
1.71
2.42
Use this table to give an example of:
  1. A medium pair so that light speeds up when it goes from one of these medium to another.
  2. Amedium pair so that light slows down when it goes from one of these medium to another.
The speed of light in water is 2.25 × 10m/s. If the speed of light in vacuum be 3 × 108m/s, calculate the refractive index of water.
A teacher gives a convex lens and a concave mirror of focal length of 20 cm each to his student and asks him to find their focal lengths by obtaining the image of a distant object. The student uses a distant tree as the object and obtains its sharp image, one by one, on a screen. The distances $\mathrm{d}_{1}$ and $\mathrm{d}_{2}$ between the lens/mirror and the screen in the two cases and the nature of their respective sharp images are likely to be
a. ( $20 \mathrm{~cm}, 40 \mathrm{~cm}$ ) and (erect and erect)
b. ( $20 \mathrm{~cm}, 40 \mathrm{~cm}$ ) and (inverted and inverted)
c. ( $20 \mathrm{~cm}, 20 \mathrm{~cm}$ ) and (inverted and inverted)
d.( $20 \mathrm{~cm}, 40 \mathrm{~cm}$ ) and (erect and inverted)
Give reason for your answer.
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  3. What happen when he moves the object very close to the lens?
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