Ray Optics Test...

Monochromatic light is incident on  two slits 0.2 mm apart. If the first order bright fringe is 4.8 mm from the central bright spot on a screen located a distance of 1.5 m from the double slit, what is the wavelength of the light (in nm)?

Light rays from a point object

The dispersive power of a material of lens of focal length 20 cm is 0.08. The longitudinal chromatic aberration of the lens is

An electric bulb is suspended at a height h from the centre of a table having a surface of radius r. If the illuminance at the edge of the table is 1/8^th as that at the centre, then the height of the bulb in terms of r is

Light of wavelength 6500 Å is incident on a slit. If the first minima for red light is at 30^o, then the slit width is

The minimum deviation produced by a glass prism having an angle of 60^o is 30^o. If the velocity of light in vacuum is 3 x 10¹⁰ cm/s, then what is its velocity in glass?

According to the mirror equation