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A bulb of 100  is hanging at a height of one meter above the centre of a circular table of diameter . If the intensity at a point on its rim is , then the intensity at the centre of the table will be

a)

b)

c)

d)

Question ID - 153039 :-

A bulb of 100  is hanging at a height of one meter above the centre of a circular table of diameter . If the intensity at a point on its rim is , then the intensity at the centre of the table will be

a)

b)

c)

d)

1 Answer
5876 Votes
3537
Answer Key : (d) -

(d)

The illuminance at

And illuminance at point

From equation (i) and (ii)


Next Question :

A book can be read if it is placed at a distance of 50 cm from a source of 1 cd. At what distance should the book placed if the source is of 16 cd?

a)

8 m

b)

4 m

c)

2 m

d)

1 m

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