Answer question 4 with proper steps Q 4 The power of a combination of two lenses XY is - Science - Light - Reflection and Refraction

Question

Answer question 4 with proper steps
Q 4 The power of a combination of two lenses XY is 5 D if the focal
length of lens X is 15 cm State the nature and focal length of lens
Y

Vijay Shankar Yadav · Accepted Answer

Dear Student,
Focal length of combination =15m=20cmThen according to question 115+1fY=1201fY=120-115fY=-60cm Y will act like a concave lens 
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Answer question 4 with proper steps. Q.4. The power of a combination of two lenses XY is 5 D if the focal length of lens X is 15 cm. State the nature and focal length of lens Y.

Answer question 4 with proper steps.
Q.4. The power of a combination of two lenses XY is 5 D if the focal length of lens X is 15 cm. State the nature and focal length of lens Y.