Question

Find the diameter of the image of the moon formed by a spherical concave mirror of focal length 7.6 m. The diameter of the moon is 3450 km and the distance of the earth and the moon is `3.8 xx 10^5 km.`

Answer 1

Correct Answer - `10.35cm = (3933)/(380)cm`
Moon acts as object at infinity, so image is formed at foucus.
`|m| = |(-v)/(u)| d_(0) = (11.4xx3450)/(3.8xx10^(8)) km = 10.35cm`