A plane glass slab is kept over various colour letters, the letter which appears least raised is :
red
violet
green
blue
A.
red
Refractive index :- The extent of bending of light rays entering from one medium to another is known as "Refractive index".
For red colour, the refractive index is minimum, i.e it will have maximum apparent depth and hence, appears least raised.
Explain two advantages of a reflecting telescope over a refracting telescope.
In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of 45o with the x-axis meets the experimental curve at P. The coordinates of P will be
An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distance are measured by
Two lenses of power -15D and +5D are in contact with each other. The focal length of the combination is
The angle of incidence at which reflected light totally polarized for reflection from air to glass (refractive index n), is
If θ1 and θ2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip θ is given by
Mock Test Series
