An electric bulb is hanging above the centre of a circular table of radiys 3m at a height of 3m from the its centre. Find the ratio of illuminance at

Question

An electric bulb is hanging above the centre of a circular table of radiys 3m at a height of 3m from the its centre. Find the ratio of illuminance at

An electric bulb is hanging above the centre of a circular table of radiys 3m at a height of 3m from the its centre. Find the ratio of illuminance at the centre and at a point on the edge of the table.

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

Related Questions

An electric bulb has a solid cylindrical filament of length `l` and radius `r` and it consumes power P when connected to a power source. Another bulb

2 Answers 5 Views

A point light source illuminates a screen the, maximum illuminance being `I_(0)` How will the illuminance of this point change if a large plane mirror

2 Answers 4 Views

Find the average illuminance of the irradiated part of an opaque sphere receiving. (a) a parallel luminous flux producing illuminance `I_(0)` at point

2 Answers 4 Views

A luminious hemispherical dome rests on a horizontal plane. Find the illuminance at the centre of the plane if its luminances in L and is independent

2 Answers 4 Views

A bulb contains air at atmospheric pressure at `40^(@)C`. The maximum pressure bulb can with stand is `2` atmosphere. Calculate of air when the bulb i

2 Answers 6 Views

A 60W lamp is rated at 0.8 watt/candela. Calculate (i) luminous intensity of the lamp, (ii) luminous flux of the lamp, and (iii) illuminance at a dist

2 Answers 4 Views

An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point 2m away from the bulb is `5 xx 10^(-4)` phot. Th

2 Answers 7 Views

A lamp is hanging along the axis of a circular table of radius r. at what height should the lamp be placed above the table so that the intensity of il

2 Answers 7 Views

A convex surface of radiys of curvature 20 cm separates air from glass of refractive index 1.5. Find the position and the nature of the image of a sma

2 Answers 5 Views

The length of a cuboid is 2 cm more than its height, whereas its breadth is 2 cm less than the height. Its height is equal to the side of a square hav

2 Answers 7 Views

Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - `2sqrt(2):1`

5 views Answered 2023-02-05 15:29