Light: Mirrors and Lenses

When the light is incident along the normal on the mirror, which of the following statements is true

Hold a magnifying glass over text and identify the distance where you can see the text bigger than they are written. Now move it away from the text. What do you notice? Which type of lens is a magnifying glass?

Match the entries in Column I with those in Column II. | Column I | Column II | | :--- | :--- | | (i) Concave mirror | (a) Spherical mirror with a reflecting surface that curves inwards. | | (ii) Convex mirror | (b) It forms an image which is always erect and diminished in size. | | (iii) Convex lens | (c) Object placed behind it may appear inverted at some distance. | | (iv) Concave lens | (d) Object placed behind it always appears diminished in size. |

The following question is based on Assertion/Reason. Assertion: Convex mirrors are preferred for observing the traffic behind us. Reason: Convex mirrors provide a significantly larger view area than plane mirrors. Choose the correct option

Visit a nearby hospital or the clinic of an ENT specialist, or a dentist, with your teacher or parents. Request the doctor to show you the mirrors used for examining ear, nose, throat, and teeth. Identify the kind of mirror used in these instruments.

Use online tools or animation to do virtual experiments with spherical mirrors and lenses. Move objects in the simulation and observe how the image changes.