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`        The radii of curvature of a double convex lens are 15cm and 30cm and its refractive index is 1.5. then its focal length is      A. +10  	 -10 	+20	-20`
2 years ago

CHALLA NAVNEESWAR REDDY
33 Points
```							we know the formula1/f=R.I(-1)(1/R1-1/R2)=1.5(-1)(1/15-1/30)  ,     =-1.5(1/30)=      1/f=  -1/20 ,     f=-20focal length=-20cm
```
2 years ago
Dhruv Shah
26 Points
```							Answer is +20 bcoz one has radius of curvature +15 and other has -30 and so on subsituting we get (Nrel-1)(1/r1-1/r2)(3/2-1)(1/15-(-1/30))(1/2)(1/10)1/20F=20cm
```
2 years ago
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• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions