10.
B. State whether the following statements are true (T) or false (F). Correct the false statements.
1. Light always travels in a straight line.
2. As the light enters another medium, its speed changes
3. The refractive index of a medium is the measure of the frequency of light in that medium with
respect to the frequency of light in air.
4. Swimming pool appears to be shallow because of dispersion.
5. The radius of curvature is the radius of the sphere of which the mirror is a part.
6. A ray passing through the focus falls normally on the reflecting surface of the mirror.
7. A rainbow is formed when white light from the sun passes through tiny prism-like water droplets
and splits into different colours.
8. A convex mirror always forms a magnified image behind the mirror.
Answers
Answer:
1.Light always travels in a straight line. false
2.As the light enters another medium, its speed changes. true
Explanation:
1.Light Travels Along a Straight Line Life without light would have been pretty dull. Light travels at a speed of 186,000 miles per second. You must have observed that in your house that whenever a beam of light enters a dark room through a tiny hole in the window, the lightwave always travels in a straight line.
2.When light traveling in a vacuum enters a new transparent medium, such as air, water, or glass, the speed is reduced in proportion to the refractive index of the new material. This interactive tutorial explores the reduction in the speed of light as a function of refractive index in common substances. Speed of Light in Transparent Materials.
3.The refractive index of a medium is dependent (to some extent) upon the frequency of light passing through, with the highest frequencies having the highest values of n. For example, in ordinary glass the refractive index for violet light is about one percent greater than that for red light.
4.A swimming pool, swimming bath, wading pool, paddling pool, or simply pool is a structure designed to hold water to enable swimming or other leisure activities. Pools can be built into the ground or built above ground, and are also a common feature aboard ocean-liners and cruise ships. In-ground pools are most commonly constructed from materials such as concrete, natural stone, metal, plastic, or fiberglass, and can be of a custom size and shape or built to a standardized size, the largest of which is the Olympic-size swimming pool.
5.Radius of curvature of mirror is defined by the radius of the sphere from which the mirror was cut from. Take for example this concave/convex mirror combination: They are both cut from the same sphere with radius measured from the center(C) to the circumference. This is how the radius of a mirror is determined.
6.ne surface of the mirror is silvered. Reflection takes place at the other surface. If the reflection takes place at the concave surface, (which is towards the centre of the sphere) it is called concave mirror. If the reflection takes place at the convex surface, (which is away from the centre of the sphere)...
7.Rainbow is formed when sunlight is refracted that is bent while passing through the water droplets. The raindrops bend the light acting like tiny prisms, splitting white light of the sun into its individual, different colours. White light is made of a combination of colours, the ones we refer to as VIBGYOR – the colours of rainbow.
8.Only a convex mirror could produce such an image. The upright images produced by concave mirrors (when object is in front of F) are magnified images. And the upright images produced by plane mirrors have the same size as the object.
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