Two thin double convex (convex-convex) lenses are placed incontact. If each has

Question

Two thin double convex (convex-convex) lenses are placed incontact. If each has a focal length of 20 cm, how would you expectteh combination to function?
A. bout like a single lens of focal length 40 cm B about like a single lens of focal length less than 20 cm
C about like a single lens of focal length 20 cm D about like a single lens of focal length slightly greaterthan 20 cm
Please if you know the answer dont just write it, give me somesort of reasoning thankss Two thin double convex (convex-convex) lenses are placed incontact. If each has a focal length of 20 cm, how would you expectteh combination to function? A. bout like a single lens of focal length 40 cm B about like a single lens of focal length less than 20 cm
C about like a single lens of focal length 20 cm D about like a single lens of focal length slightly greaterthan 20 cm Please if you know the answer dont just write it, give me somesort of reasoning thankss

Explanation / Answer

The combined focal length is :                     1 / f   = 1/ f1   +   1 /f2                               = 1 /20 + 1/ 20                              =   2 ( 1/ 20)                                    = 1 /10                focal length   f   = 10cm Hence the answer is :                         B . about like a single lens offocal length less than 20 cm


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