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TEST (LIGHT) NAME:. MARKS:.

1. Diagram shows an object seen by an observer in a plane mirror. Draw a ray diagram to show how theobserver can see the image of the object.

[3 marks]

(a) State four characteristics of the image formed by a plane mirror.

......*4 marks+

2. (a) Figure shows an object is placed between C and F in front of a curved mirror.

(i) Draw two light rays to show the formation of image of the object by the mirror. [3 marks](ii) State three characteristics of the image.

*3 marks]

(b) Figure shows an object O standing in front of a convex mirror and label the image as I.[F=focal point, C = center of curvature]

(i) On Figure, draw two light rays to show the formation of image by the convex mirror. [3 marks](ii) State three characteristics of the image.

*3 marks]

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3. Diagram shows a periscope without right-angled prisms. Draw the prisms to enable the observer to seethrough the periscope. On Diagram, draw the correct position of the right-angled prisms so that the

observer can see the image of the object. Complete the path of the light ray of the object to the

observers eye. [3 marks]

4.

5. (a) Figure shows an object X placed in front of a convex lens.

(i) On the diagram, draw the light rays to show the formation of image of the object X by the lens.Label the image as I. *f=focal length+ [3 marks]

(ii) State three characteristics of image formed by the convex lens..... [3 marks]

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(b) Figure shows an object Y placed in front of a concave lens.

(i) On the diagram, draw the light rays to show the formation of image of the object Y by the lens.Label the image as I. *f=focal length+ [3 marks]

(ii) State three characteristics of image formed by the concave lens. *3 marks+

6. You are given two convex lenses S and Q of different focal length. Lens S has a longer focal length than lens Q.Using the two lenses above explain how are you would make a simple astronomical telescope.

Suggest modification that needs to be done on the telescope to produce clearer and bigger images.[10 marks]

7. You are given two convex lenses, R and S, with focal lengths of 40 cm and 10 cm respectively. Both the lensesare used to build a compound microscope.

(i) Using the two lenses, explain how you would build a compound microscope.

(ii) Suggest a suitable optical device to modify the microscope you built to produce brighter image.

[10 marks]

8. You are asked to investigate the arrangement and characteristics of the lenses used to construct the simpleastronomical telescope.

Arrangementof lenses

Focal length of

objective lens, fo /cm

Magnification

of image

Distance between

objective lens and

eyepiece, D / cm

Diameter of

objective lens, d /cm

J 40.0 4.00 D = fo +fe Large

K 40.0 0.25 D > fo +fe Small

L 10.0 4.00 D < fo +fe Large

M 10.0 0.25 D = fo +fe Small

Explain the suitability of the arrangement and each characteristics of the lenses and determine the arrangement

which can produce the brightest and sharp image at normal adjustment.

[10 marks]

9. Table shows the characteristics of four different compound microscope.Microscope Focal length of

objective lens, fo /cm

Type of objective

lens

Type of eyepiece

lens

Object distance from the

objective lens, u/cm

S 40 Convex Convex 2f < u < f

T 10 Concave Concave u < f

U 10 Convex Convex 2f < u < f

V 40 Concave convex u < f

Explain the suitability of each characteristics of the compound microscope. Determine the most suitable

microscope to be used and give one reason for your choice. [10 marks]