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3. Answer the following questions in 16-20 words:
a) Define refraction
b) A martie tle feels cold as compared to a wide a
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4. Answer the following questions in 30-40 words:
a) Distinguish between a dinical thermometer and a bateratzen
b) State the two laws of reflection
c) Give one use of a convex mirror and a concave mimo dong the
d) Complete the following ray diagram by matting the path light the formato
the image, and labelling the pole, the centre of an the progos and the
aperture
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Answers
Answer:
3)
a. In physics, refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium. Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction.
4)
a. Clinical Thermometer is meant for clinical purposes. It is developed for measuring the human body temperature. A laboratory thermometer, which is colloquially known as the lab thermometer, is used for measuring temperatures other than the human body temperature.
b. The laws of reflection are as follows: The incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence lie in the same plane. The angle which the incident ray makes with the normal is equal to the angle which the reflected ray makes to the same normal.
c. They are used to focus light. Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror. These mirrors are called "converging mirrors" because they tend to collect light that falls on them, refocusing parallel incoming rays toward a focus.