4. a convex lens has radii of curvature 15 cm and 10 cm. Lens material is
having refractive index 1.6 then focal length of lens is
(a) 5cm
(c) 15cm
(b) 10cm
(d) 20cm
Answers
Answered by
0
Answer:
15
Explanation:
According to the len's maker formula,
f1=(μmμl−1)(R11−R21)f1=⎝⎜⎜⎜⎛123−1⎠⎟⎟⎟⎞(151−(−151))f1=(21)(152)∴f=15cm
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