A double convex lens has two surfaces R1 =2cm,R2=5cm and refractive index n=3.find focal length
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Answer:
focal length=0.714cm
Step-by-step explanation:
1/f=(3-1)(1/2+1/5)
1/f=2×(5/10+2/10)
1/f=7/5
f=5/7=0.714cm
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1/f=(1/R1+1/R2)(n-1)
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