Question

A magnifying glass uses a convex lens of focal length 6.25 cm. When it is held 5.20 cm in front of an object, what is the image distance?
(Mind your minus signs)
(Unit=cm)

Answer 1

Answer:

The answer is -30.95.

Explanation:

Use the lens equation: 1/focal length = 1/object distance + 1/image distance. The answer comes out to -30.95. This is correct on Acellus.

Answer 2

When it is held 5.20 cm in front of an object, the image distance will be "-30.95 cm". To understand the calcultaion, check below.

Convex lens

According to the question,

Object distance, u = -5.20 cm

Focal length, f = 6.25 cm

By using the Lens formula, we get

→ $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$

or,

→ $\frac{1}{v} = \frac{1}{f} + \frac{1}{u}$

By substituting the values, we get

     $= \frac{1}{6.25} - \frac{1}{5.20}$

  $\frac{1}{v} = -\frac{21}{650}$

By applying cross-multiplication,

   v = -30.95 cm

Thus the above answer is correct.  

Find out more information about Convex lens here:

https://brainly.com/question/13102253