Science Question Answer (2 Marks)

Blind spot is the point in human eye where the image is not visible. This is because there are no photoreceptors, i.e., rods and cones present in the optical disk.

Cornea is the transparent front part of an eye. It covers the front portion of the eye.

For a single incident ray falling on a plane mirror, there is always a single reflected ray. The angle of incidence is always equal to the angle of reflection, this is by the law of reflection.

Blind spot is the point in human eye where the image is not visible. This is because there are no photoreceptors, i.e., rods and cones present in the optical disk.

The angle made by the normal will be 90 – 75 = 15. Angle made by normal is equal to angle of incidence. So i = 15 degree. And by the law of reflection which states that angle of incidence is equal to the angle of reflection, the angle of reflection will be 15 degree.

Normal is an imaginary line perpendicular to the surface, in the reflection of light from a plane mirror.

Rods are rod shaped cells present in the retina are sensitive to dim light. They are most important for vision in dim light. Cones are cone shaped cells present in the retina are sensitive to bright light. These photoreceptor cells are responsible for color vision.

Infinite number of images of the candle will be formed because the mirrors are placed parallel to each other.

Dispersion of light is the separation of white light or visible light into different colors is known as dispersion. Formation of rainbow is a natural phenomenon which is caused by the dispersion of sunlight in the sky. The sunlight splits into 7 colors, namely, violet, indigo, blue, green, yellow, orange and red.

Objects that have their own light i.e., objects that emit light of their own are known as luminous objects. 2 luminous objects are- stars and sun. The sun and the stars have their own light. A light bulb is also luminous.