In case of concave mirror if the object is at infinity and the image is formed at the focus F. What will be the nature of image ?

Light travel in _______________________ .

Which of the following is a ray ?

The ray of light, coming towards the mirror, is called the _______________________ .

Multiple reflection can be obtained by placing ____________  mirror at certain angle to each other which results in reflection of light for multiple times between reflecting surfaces.

A ray coming through __________________ of a convex mirror, reflects back along the same path on striking the mirror surface.

Which of the following are correct :

(a) When the group of rays are parallel to each other such beam of light is called a parallel beam of light.

(b) When the group of rays are not parallel to each other but are converging at a point such beam of light is called a convergent beam of light.

Which of the following are correct :

(a) Multiple reflection is used at barbar shop to see the back of our head .

(b) Multiple reflection is used in the dressing table.

The hollow surface that is on the same side as the centre of the original sphere is called  _______________________.

Which of the following are correct :

(a) In a Kaleidoscope, three plane mirrors inclined at an angle of 90⁰ to each other are fixed inside a cylindrical box.

(b) In Periscope, the mirrors are aligned parallel to each other at a 60⁰ angle with the addition of two simple lenses.

(c) A periscope is a tool we use to see things that would otherwise be hidden or obstructed or not in the direct line of sight.