Question

How to draw a ray diagram when image and object distances are known???For example, u=-10 and v=+30 f=-15​

Answer 1

here the focal length is -15

hence it is a concave mirror(or convex lens)

but we will do it by taking concave mirror

here f=-15

and u=-10

so it is placed between pole and focus and we know that if the object is between pole and focus the image formed on opposite side of mirror. hence we can draw it if u draw mirror of given focal length and mark a object in given 'u' so the 'v' will satisfied ...hope it helps