Question

Suppose an object is placed u cm in front of a spherical mirror of focal length f such that the image is formed v cm from the mirror, then u, v and f are related by the equation; 1/f= 1/u + 1/v. This equation is referred to as the mirror formula. The formula holds for both concave and convex mirrors.​

Answer 1

★Answer

• a concave mirror always forms real and inverted and images except when the object is placed between the focal point and the pole of the mirror when it forms a virtual and inverted image. On the other hand, a convex mirror always forms a virtual, erect and diminished image.

a concave mirror always forms real and inverted and images except when the object is placed between the focal point and the pole of the mirror when it forms a virtual and inverted image. On the other hand, a convex mirror always forms a virtual, erect and diminished image.A real image is that image formed by actual intersection of real rays while a virtual image is formed by imaginary rays. Furthermore, a real image can be formed on a screen while a virtual image cannot be formed on a screen.

solution

u=30cm, f= 15cm, ho=4cm

u=30cm, f= 15cm, ho=4cm1/v=1/f-1/u

u=30cm, f= 15cm, ho=4cm1/v=1/f-1/u= 1/15 – 1/30 =1/30

u=30cm, f= 15cm, ho=4cm1/v=1/f-1/u= 1/15 – 1/30 =1/30v =30cm

Also, m=v/u =hi/ho

Also, m=v/u =hi/hoThus, hi=(30cm x 4cm)/30cm =4cm.

Also, m=v/u =hi/hoThus, hi=(30cm x 4cm)/30cm =4cm.Thus the image formed is real and same size as the object.

Answer 2

Answer:

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