SATHEE: Optics Question 495

Optics Question 495

Question: A lamp is hanging 1 m above the centre of a circular table of diameter 1m. The ratio of illuminaces at the centre and the edge is

[NCERT 1982]

Options:

A) $\frac{1}{2}$

B) ${(\frac{5}{4})}^{\frac{3}{2}}$

C) $\frac{4}{3}$

D) $\frac{4}{5}$

Show Answer

Answer:

Correct Answer: B

Solution:

$\frac{I_{c e n t r e}}{I_{e d g e}} = \frac{{(r^{2} + h^{2})}^{3 / 2}}{h^{3}}$

$= \frac{{(1 + \frac{1}{4})}^{3 / 2}}{1^{3}}$

$= {(\frac{5}{4})}^{3 / 2}$

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Optics Question 495

Question: A lamp is hanging 1 m above the centre of a circular table of diameter 1m. The ratio of illuminaces at the centre and the edge is

Options:

Answer:

Solution:

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