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ICSE Class 9 Answered

the image of a small electric bulb fixed on the wall of a room is to be obtained on opposite wall 4m away by means of large convex lens. What is the maximum possible focal length of lens required for the purpose?
Asked by dev.sultanpur123 | 01 Jun, 2015, 12:47: AM
answered-by-expert Expert Answer
begin mathsize 14px style The space distance space between space the space object space and space the space image comma space straight d space equals space 4 space straight m Maximum space focal space length comma space straight f equals straight d over 4 straight f equals 4 over 4 space equals space 1 space straight m therefore The space maximum space possible space focal space length space of space the space convex space lens space is space 1 space straight m. end style
Answered by Faiza Lambe | 01 Jun, 2015, 09:46: AM
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