Science, asked by divyakashyap16686, 1 year ago

. An object of height 4.0 cm is placed at a distance of 30 cm from the optical centre 'O' of a convex lens of
focal length 20 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical
centre 'O' and principal focus 'F' on the diagram. Also, find the approximate ratio of size of the image
to the size of the object.

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Answered by koushik2004610

Answer:

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Answered by Anonymous

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In this question I am going to use a scale of 1:5 to draw this diagram.

When I use this scale:

Focal length =20/5=4cm

Object height =4/5=0.8cm

The object distance =30/5 =6cm.

From the diagram, the image height is 1.6cm.

Which from the scale is : 1.6 × 5=8cm

The ratio of image size to object size is : 8:4=2:1

The ratio= 2:1

Find diagram in the image.

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