Question

radius of curvature of a mirror is 20cm what is the focal length of the mirror​

Answer 1

Explanation:

the focal length is 10cm

since we know that

the relationship between F & R

is : r=2f

f= r/2

f= 20/2

= 10cm

Answer 2

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हम जानते हैं कि फोकस दूरी वक्रता - त्रिज्या

की आधी होती है ।

अर्थात ,फोकस दूरी f = R/2 = 20/2 = 10 cm