Question

An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm. (i) use lens formula to find the distance of the image from the lens (ii) List 4 characteristics of the image (nature, position, size) formed by the lens in this case. (3+2)

Answer 1

Given that,

• Distance from the concave lens (u) = -60 cm [ Negative due to concave lens ]
• Focal length of the concave lens (f) = -30 cm [ Negative due to concave lens ]
• Image distance (v) = ?

According to the lens formula,

⇒ 1/v-1/u = 1/f

⇒ 1/v = 1/f + 1/u

⇒ 1/v = 1/-30 cm+ 1/-60 cm [taking LCM and solving we get the following]

⇒ 1/v = 2-1/60 cm

⇒ 1/v = -1/60 cm

⇒ 1×60 cm = v×-1

⇒ 60 cm = -v

⇒ v = -60 cm

Therefore, the distance of the image is (-60 cm).

Here, negative distance shows that the image is  real & inverted image.

Hope this helps you.

Thank you for your question it had helped me to think.

Mark me as brainiest it took lot of time to type this solution.