Optics

The wave length extension of visible light is -

Human eye is most sensitive to visible light of the wavelength :

Among the colours mentioned below, the eye is most sensitive to colours between :

Which of the following statement is not correct?

Light appears to travel in a straight line because –

Which of the following has the highest velocity?

Which of the following statement is true?

The velocity of light is maximum in –

Light from the Sun reaches Earth in about :

When light passes from one medium to another medium, which one of the followings does not change :

The reason for a swimming pool to appear less deep than the actual depth is :

Optical fibre works on the principle of :

Consider the following statements : 1. Fibre optics is based on the principle of total internal reflection. 2. In an optical fibre communication system, power consumption is extremely low. <!-- PAGE 631 --> 3. Optical fibre communications are free from radio frequency interference. 4. In India, Reliance Group of Industries is engaged in the manufacture of the optical fibre. Which of these statements are correct :

An endoscope is a -

The reason of mirage is

A cut diamond shines brilliantly due to

Which of the following is used to take 3-dimensional pictures -

Direct viewing of Sun during total solar eclipse causes irreversible damage to eyes. The retinal burn is caused by which one of the following components of the sun rays?

The colour of the star is an indication of its :

The Sun and the Moon appear elliptical near the horizon because of :

Photosynthesis using the invisible part of the sunlight is done by some –

Which one of the following energy conversions takes place in carrying out the process of photosynthesis?

Diffusion of light in the atmosphere takes place due to :

The colour of light is determined by its

Which one of the following colours of white light is least deviated by the glass prism?

Red light is used in traffic signals because :

Assertion (A): The danger signal is made up of red colour. Reason (R) : Red colour is scattered the least. Select the correct answer using the codes given below:

The red colour of the Sun at sunset and sunrise is due to –

An astronaut sees the colour of the sky as –

The number of colours contained in the sunlight is –

The (Green) Grass appears green to us because :

The concept of expanding universe is based on –

In driving a car which type of mirror would you like to use for observing traffic behind you?

The image formed by astronomical telescope is

Assertion (A): Black hole is such a celestial existence which cannot be seen by telescope. Reason (R) : The gravitational field of black hole is much strong that even light does not escape from it. Code :

The number of images of an object placed between two parallel mirrors is :

Which one of the following colours is seen in the middle of a Rainbow?

An air bubble in water will act like a :

The minimum height of a plane mirror to see the full size image of a person is equal to -

The minimum height of mirror required to see whole stand up image of a man of height 1.50 metre shall be

The radius of curvature of the plane mirror is :

The least distance of distinct vision is (cm.) :

Which one of the following statement is not true for a person suffering from hypermetropia?

Which of the following lenses is used to minimize Myopia?

A myopic eye can be corrected by using a :

The focusing in the eye is done by :

Which one of the following statement is not correct?

The mirror, which is used in searchlights, is -

A dentist mirror is a -

Power of the sunglass is -

Two glass lenses of same focal length, one being convex and the other concave, are kept in contact, the combination will act as :

The image formed on Retina is :

Retina of the eye is comparable to which of the following parts of a traditional camera?

In long-sightedness, images are formed at following :