concave mirror produces the image of sun at a distance of 20cm, the focal length of
concave mirror is ...
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Answered by
4
Hey Mate !
- Image Position (v) = 20 cm
- Object Position (u) = -∞
- Concave Mirror
- Focal Length (f) = ?
Use mirror formula
⇒ 1/f = 1/v + 1/u
⇒1/f = 1/20 + 1/-∞
⇒1/f = 1/20 - 1/∞
⇒1/f = 1/20 - 0
⇒f = 1/20
⇒ f = 20 cm
Answered by
3
Answer:
20 centimetres
Explaination:
concave mirror has focal length of 20 centimetres...
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