NCERT 7th Class (CBSE) Science: Light

Question: What do you means by lateral inversion?

Answer: Lateral inversion means left looks like right and right looks like left in a mirror.

Question: What is a spectrum?

Answer: Spectrum is the band of colours seen when the white light passes through the prism and splits into seven colours.

Question: What is Reflection?

Answer: The bouncing off of light from a surface known as reflected light.

Question: Name the mirror that forms only diminished image.

Answer: Concave mirror.

Question: What is bouncing off light from the surface called?

Answer: Bouncing off light from the surface is called reflection of light.

Question: A lens produces a magnified virtual image of an object. Name the lens.

Answer: Convex lens.

Question: What is the image that can be projected on a screen?

Answer: Real image can be projected on a screen.

Question: What is the splitting of light into its component colour called?

Answer: Dispersion of light

Question: What do you mean by rectilinear propagation of light?

Answer: Rectilinear propagation of light means that beam of a light always travels in a straight line.

Question: How can we change the direction of the light?

Answer: We can change the direction of the light by the phenomenon called reflection.

Question: What do you mean by reflection of light?

Answer: When a ray of light falls on the surface of any mirror, it bounces back in the same medium. This is called reflection of light.

Question: What is a mirror?

Answer: Any polished or shining surface is called a mirror.

Question: What do you mean by a real image?

Answer: Image which cannot be obtained on a screen is called a real image.

Question: What do you mean by a virtual image?

Answer: Image which cannot be obtained on a screen called virtual image.