A convex lens of focal length 10 cm is placed in closed contact with a concave lens of focal length 10 cm. What is The power of combination?
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A convex lens of focal length 10 cm is placed in closed contact with a concave lens of focal length 10 cm. What is The power of combination?
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Answer:
20 cm
Explanation:
Given,
f¹=+10 cm
f²=-20 cm
The focal length of the combination is given by
1\f=1\f¹+1\f²
1/f=1/10+1/-20 = 1/20 cm
f=+20cm