Refraction of light: Laws of refraction, refraction by glass slab, critical angle, total internal reflection and daily life applications, lenses (converging and diverging), focal length, optical centre, image formation by lens, human eye (defects and remedies), comparison between photographic camera and human eye, simple telescope and astronomical telescope

The rays of different colours fail to converge at a point after going through a convex lens. This defect is called

The focal length of a convex lens are $f_V$ and $f_R$ for violet and red light respectively, then which one of the following relation is correct ?

The phenomenon of splitting of light into its component colours is known as

What is used for correcting astigmatism?

Consider the four statements given below related to the images in a converging lens and choose the correct answer depicting the correct statements from the given options :
(a) When the object is at a distance 2F from the lens, the image is real, inverted and of the same size as that of the object.
(b) When the object is between 2F and F, the image is real, inverted and bigger than the object.
(c) When the object is farther than 2F from the lens, the image is real, inverted and smaller than the object.
(d) When the object is nearer than F, the image is inverted, magnified and virtual.

The near point N of a defective eye is 30 cm from the eye. If the normal near point is 25 cm from the eye, the power of the lens needed to correct this defect will be

For correcting many defects of human eye vision LASIK procedure is often done which is an abbreviation of

Red light of wavelength 632 nm in free space is incident at an angle of $\t$theta = 39^\circ$ with respect to the normal on a glass slide of thickness d = 0.78 mm and index of refraction n = 1.52. The wavelength of light in glass will become

A Cassegrain telescope is advantageous because it:

The focal length of eye lens is controlled by

The power of convex lens of focal length 25 cm is

When a thin convex lens is put in contact with a thin concave lens of same focal length. The resultant combination has focal length equal to

A person cannot see objects clearly beyond 50 cm. The power of the lens to correct the vision is

The image of an object is formed by a convex lens on a screen. If lower half of the lens is painted black , the intensity of image becomes:

Maximum lateral displacement of the ray of light incident on a slab of thickness t is: