Question

The image of a candle flame placed at a distance of 45cm from spherical lens is formed on a screen placed at a distance of 90cm from the lens. Identify the type of lens and calculate it's focal length. If the height of a flame is 2 cm find the height of the image...(class 10)

Answer 1

Answer:

Given: Object distance, u = -45 cm

Image distance, V = +90 cm (real)

Height of the object, h = 2 cm

We need to calculate the Focal length

Applying the lens formula which is given as:

Since, focal length is positive, so the lens is convex lens.

Magnification is given by the following relation;

Also, the magnification is given by the ratio of height of image to the height of object.

The negative sign shows that the image is inverted

Explanation:

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