An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point 2 m away from the bulb is 
phot ( lumen/cm 2 ). The line joining the bulb to the point makes an angle of 60 o with the normal to the surface. The intensity of the bulb in candela is
A
B
40
C
20
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
If luminous efficiency of a lamp is 2 lumen/watt and its luminous intensity is 42 candela, then pow…
In a movie hall, the distance between the projector and the screen is increased by 1% illumination …
Correct exposure for a photographic print is 10 seconds at a distance of one metre from a point sou…
A bulb of 100 watt is hanging at a height of one meter above the centre of a circular table of diam…
A movie projector forms an image 3.5 m long of an object 35 mm . Supposing there is negligible abso…
A 60 watt bulb is hung over the center of a table 4 m × × 4 m at a height of 3 m . The ratio of the…