1.

Combination of two convex lenses works always as .......

Answer»

concave lens
convex lens
rectangular glass slab
plane mirror

Solution :EQUIVALENT focal length of combination,
In `F=(f_1f_2)/(f_1+f_2)` for concave lens.
`f=((f_1)(f_2))/(f_1+f_2)`
`therefore f=`positive `therefore` WORKS as convex lens.


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