Question

which optical device can produce magnification plus 3​

Answer 1

Answer:

Convex lens

Explanation:

In case of concave lens,

the image produced is always smaller than the object so magnification cant be greater that +1 or smaller than -1.

So,concave lens isnt the answer.

In case of convex lens,

the image produced can be bigger than the object when object is placed

(i) between C1 and F1

(ii) at F1

(iii) between F1 and P

and for magnification to be positive, the image should be virtual and erect. This can be achieved only when object is between F1 and P.

So, convex lens can produce a magnification of +3.