The diagram alongside shows a lens as a combination of a glass slab and two prisms.

(i) Name the lens formed by the combination.

(ii) What is the line XX' called ?

(iii) Complete the ray diagram and show the path of the incident ray AB after passing through the lens.

(iv) The final emergent ray will either meet XX' at a point or appear to come from a point on XX'. Label the point as F. What is this point called ?

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Solution

(i) The combination forms a convex lens.
(ii) XX' is known as the principal axis.
(iii)

(iv) The point F is called the second focus.

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Similar questions

The diagram alongside shows a lens as a combination of a glass slab and two prisms.

(i) Name the lens formed by the combination.

(ii) What is the line XX' called ?

(iii) Complete the path of the incident ray AB after passing through the lens.

(iv) The final emergent ray either meets XX' at a point or apppears to come from a point on XX'. Label it as F. What is this point called ?

A ray of light after refraction through a convex lens emerges parallel to the principal axis. (a) Draw a ray diagram to show it. (b) The incident ray passes through a point F on the principal axis. Name the point F.

A ray of light, after rerfraction through a concave lens emerges parallel to the principal axis. (a) Draw a ray diagram to show the incident ray when produced meets the principal axis at point F. (b) Name the point F.

A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens. (a) What special name is given to this point on the principal axis ? (b) Draw a labelled diagram to support answer in part (a).

Q. The given figure shows an object AB, placed on the principal axis of a convex lens.

F_{1}

and

F_{2}

are the foci of lens Copy the diagram.

(a) Draw a ray of light from point B and passing through O. Show the same ray after refraction through the lens.
(b) Draw another ray from B, which passes through

F_{2}

, after refraction by the lens.
(c) Locate the final image formed.
(d) Is the image real or virtual?
(e) The image formed is inverted or erect?
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(i) The combination forms a convex lens. (ii) XX' is known as the principal axis. (iii) (iv) The point F is called the second focus.

(i) The combination forms a convex lens.
(ii) XX' is known as the principal axis.
(iii)

(iv) The point F is called the second focus.