f = r/2 is valid
f = r/2 is valid
The number of images observable between two parallel mirrors is
The number of images observable between two parallel mirrors is
The number of images observable between two parallel mirrors is Read More »
A ray of light is incident on a plane mirror at an angle of incidence 300. The ray after reflection is deviated through
A ray of light is incident on a plane mirror at an angle of incidence 300. The ray after reflection is deviated through
In a photometer two sources of light when placed at 30 and 50 cm respectively produce shadow of equal intervals. Their candles are in the ratio of
In a photometer two sources of light when placed at 30 and 50 cm respectively produce shadow of equal intervals. Their candles are in the ratio of
Two thin lenses, one of focal length +60 cm and the other of focal length -20 cm are kept in contact. Their combined focal length is
Two thin lenses, one of focal length +60 cm and the other of focal length -20 cm are kept in contact. Their combined focal length is
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
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?
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 ?
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
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