CH-10 Optical Instruments

Any transparent medium bounded by one or two spherical surface ,is called:

A lens which is thicker from middle and thinner from edges called:

The ratio of the size of image to the size of object is called:

The ratio of the angle subtended by the image as seen through the optical device to that angle subtended by the object at the eye is called:

A point where the incident rays of light converge or appears to diverge after passing through the lens is called:

The distance of near point from the eye is about:

The distance between the principal focus and the optical centre of the lens is called:

When an object is brought from a far point to the focal point of convex lens, the size of image is:

The apparent size of the object depends upon its actual size and angle subtended by it at the:

The unit of power of lens is:

The focal length of convex lens is:

If an object is placed in front of convex lens then the image will be:

If an object is placed at 2F from convex, lens the image is located behind the lens:

Magnification of a lens is positive when the image is:

The magnifying power of a simple microscope is:

The convex lens used in compound microscope as objective has focal length:

If a single convex lens is placed close to the eye then it can be used as:

The magnifying power of a compound microscope is:

The eye-piece of a compound microscope acts as:

If focal length of objective is increased:

A simple astronomical telescope consists of:

The image of a distant object viewed through telescope appears:

The distance between the objective and eye- piece of a telescope in normal adjustment is:

The magnifying power of an instrument is expressed in:

Lenses of focal lengths 100 cm and 5 cm are used as objective and eye-piece of an astronomical telescope, its length for normal adjustment is:

An optical instrument used to study the properties of light:

The component of the spectrometer which consists of a fixed metallic tube with a convex lens at one end and adjustable slit is called:

The scientist who correctly measured the speed of light was:

The speed of light in vacuum or in air is:

Alexander Bell invented advice known as:

For glass air boundary, the value of critical angle is:

In Michelson's experiment, the equation used to find the speed of light is:

The focal length "f" and radius of curvature are related by:

In compound microscope the magnification of object is M₀ and magnification of eyepiece is Mₑ. The magnifying power of compound microscope is:

In vacuum light travels at a speed of 3 x 10⁸ ms⁻¹, what is the speed of light in glass of refractive index 1.5?

An object is placed between two parallel mirrors. The number of image formed is:

What will be the colour of the sky as seen from the Earth if there were no atmosphere?

An object of 2 cm tall is placed 15 cm from concave mirror of focal length 10 cm. How far is the image from the mirror?

An observer moves towards a stationary plane mirror at a speed of 4 ms⁻¹, with what speed will what speed will his image move towards him?

A spectrometer is used to measure: