A blue object on a white background when seen through a blue filter will appear
A blue object on a white background when seen through a blue filter will appear Read More »
When light travels from one medium to other whose refractive index is different, then which of the given will change?
For which of the given is luminous efficiency maximum ?
For which of the given is luminous efficiency maximum ? Read More »
The focal length of a concave mirror is f and the distance of the object to the principal focus is p . Then the ratio of the size of the image to the size of the object is
Monochromatic light of frequency 5 x 10⁴ Hz travelling in vacuum enters a medium of refractive index 1.5. Its wavelength in the medium is :
At what distance from a screen will a 27 Cd lamp provide the same illumination as a 75 Cd lamp 15 m from the screen?
In an astronomical telescope the focal length of objective lens is 100 cm and that of eyepiece is 2 cm. The magnifying power of the telescope for the normal eye is
Large aperture objects are used in telescopes because they
Large aperture objects are used in telescopes because they Read More »
Light with wavelength of 6000 A0 units has a frequency
Light with wavelength of 6000 A0 units has a frequency Read More »
A ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of 3000. Then the number of images observable is :
