Q5 of 36 Page 1

Both a spherical mirror and a thin spherical lens have a focal length of (-)15 cm. What type of mirror and lens are these?

Both are concave.


According to the preferred sign convention, the principal focus of both concave mirror and lens lies on the left-hand side of the mirror (pole).


Thus, their respective focal length is negative.


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Which of the following is not observed in a homologous series? Give reason for your choice.

a) Change in chemical properties


b) Difference in -CH2 and 14u molecular mass


c) Gradation in physical properties


d) Same functional group


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The image formed by a concave mirror is observed to be real, inverted and larger than the object. Where is the object placed?

OR


Name the part of a lens through which a ray of light passes without suffering any deviation.


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In the arrangement shown in figure there are two coils wound on a non- conducting cylindrical rod. Initially the key is not inserted in the circuit. Later the key is inserted and then removed shortly after.


What are the two observations that can be noted from the galvanometer reading