Why doctors use concave mirror to observe eyes, ear, nose, throat? We know, incident rays on a concave mirror can create convergent rays. With the help of this mirror, the rays can be accumulated in a single point. As a result, a magnified image of the object can be seen if it is placed within … Read more
Write down 4 uses of a plane mirror? 1) To make a simple periscope plane mirror is used. 2) We can see our faces by using plane mirror. 3) During an eye test, doctors use this mirror to help the patients reading out alphabets. 4) To avoid accidents on hilly roads, this mirror is placed.
Why mercury is added at the back of a mirror? To get good image mercury is added at the back of a mirror. This process is known as silvering. The opposite surface of silvering is used as the reflection surface. So it can create a facial and straight image. That’s why mercury is added at … Read more
What do you mean by side change of an image in a plane mirror? The incident of changing the left and right side of an object inversely in its image is known as the side change of an image in a plane mirror. This happens due to the same distance of object and image in … Read more
How many laws do reflection of light follow and what are they? There are two laws of reflection. They are – 1) First Law: The reflection ray will be in the plane which we imagined through the incident ray and the normal. 2) Second Law: The reflected angle is equal to the incident angle.
Dispersed reflection depends on which things? Dispersed reflection depends on following things: 1) Incident light rays need to be parallel. 2) Reflection plane needs to be unsmooth/rough. 3) Incident angles vary with incident points.
Though the moon is white in daylight, how does it look like at night after sunset? Explain. The dispersed light blue colour of the sky is mixed with the moon’s light at day. These two colour’s mixture makes the moon looks white. After sunset, the light blue colour disappears, so it looks like yellowish at … Read more
Shortly explain the nature of light. Light is an energy, that propagates as an electromagnetic wave. It sometimes acts as a wave, sometimes acts as a particle. In a particular medium, it has a particular velocity, in the air, this velocity is 3⨯108 ms-1. It goes linearly in a transparent medium. It faces reflection, refraction, diffraction, … Read more