Physics Plus Two.pdf - model question papers
Physics Plus Two.pdf - model question papers
Physics Plus Two.pdf - model question papers
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16. A lens of a particular focal length is<br />
made from a given glass slab bY<br />
adjusting radii of curvatue. The<br />
.formula<br />
used in this case is lens<br />
maker's formula.<br />
(a) write lens maker's formula. (1)<br />
(b)<br />
Derive lens maker's formula<br />
assuming formula for<br />
refraction at a sPherical<br />
surface. (3)<br />
(c) Is it possible for a given lens<br />
to act as a converging lens in<br />
one medium and a diverging<br />
lens in another medium ?<br />
Why ?<br />
(d) Compare the focal length ofa<br />
given converging lens for blue<br />
light with that using red light.<br />
Are they equal or different ?<br />
why ?<br />
OR<br />
16. A microscope is a device used to<br />
9015<br />
obtain magnified images of small<br />
objects.<br />
(l)<br />
(a) Draw a labelled raY diagrarn<br />
(l)<br />
of a comPound micruscoPe<br />
forming an image at the near<br />
point ofthe eye.<br />
@,<br />
10<br />
16, rocrriloloo;
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