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?
[5 MARKS]

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Solution

Each subpart: 1 Mark each

(a) The ray passes through optical centre emerges out without any deviation after refraction.
(b) Another ray from B, after refraction passes through $F_{2}$ .
(c) The image of the object AB is A'B' as shown in the ray diagram below.
(d) The image is virtual.

(e) The image formed is virtual, so it is erect.

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Similar questions

Q. Figure 5.49 shows an object AB placed on the principal axis of a lens L. The two foci of the lens are

F_{1}

and

F_{2}

. The image formed by the lens is erect, virtual and diminished. Copy the diagram.

(a) What type of lens is it?
(b) Draw the outline of the lens (L) used.
(c) Draw a ray of light starting from B and passing through O. Show the same ray after refraction through the lens.
(d) Draw another ray from B, which after passing parallel to the principal axis, is incident on the lens and emerges after refraction from it. (d) Locate the final image formed.
[5 MARKS]

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.

Q. A ray of light from the object, parallel to the principal axis, after refraction from a convex lens, passes through ___.

State whether the following statements are 'true' or 'false' by writing T/F against them.

(a) A convex lens has a divergent action and a concave lens has a convergent action.

(b) A concave lens, if kept at a proper distance from an object, can form its real image.

(d) A ray of light incident at the optical centre of lens, passes undeviated after refraction.

(e) A concave lens forms a magnified or diminished image depending on the distance of object from it.

Q. Indicate whether the following statements are true or false.
(a) Two plane mirrors placed at an angle of 60° will produce five images.
(b) As the angle between the mirrors decreases, the number of images formed also decreases.
(c) The turning of a ray of light as it passes from one medium to another is called refraction.
(d) When a ray of light passes from glass to air, the refracted ray moves towards the normal.
(e) A concave lens is a diverging lens.
(f) A convex lens is a diverging lens as rays parallel to the principal axis meet at a point after refraction.
(g) The bottom of a swimming pool seems higher than it actually is because of refraction of light.
(h) A convex lens produces only real images.
(i) The cornea gives colour to the eye.
(j) Vitamin A is essential for good eyesight.
(k) A magnifying glass forms a virtual, inverted image.
(l) Concave lenses bulge outwards, towards the incident light.
(m) A ray of light passing through the focus of a lens is parallel to the axis after refraction.
(n) Long-sighted people always need to wear spectacles.

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