CBSE Class 12-science Answered
1. The focal length of an equiconvex lens in air is equal to either of its radii of curvature. the refractive index of the material of lens is __________
2. A charge of 4x10^-8C is uniformly distributed over the surface of sphere radius 1cm. another hollow sphere of radius 5cm is concentric with the small sphere. find intensity of electric field at a distance 2cm from centre. [K=9x10^9 MKS] [ans in NC^-1]
3. A light of 4560angstrom and 1mW is made incident on photosensitive surface of Cs. If efficiency of surface is 0.1%, then photoelectric current produces is___________
4.A spherical drop of water has 3x10^-10C charge on its surface. 300 volt electric potential exists on its surface. if 27 such identical drops are combined to form a single drop, calculate electric potential on the surface of new drop._____________
Asked by Dhriti | 24 Oct, 2014, 12:10: PM
Expert Answer
1.
Given Focal length, f = R
Being an equiconvex lens, let R1 = R , R2 = - R
The refractive index of the material of lens is 1.5
Note: Please ask other questions (each question) as seperate separate queries.
Answered by Jyothi Nair | 25 Oct, 2014, 11:15: AM
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