Question

When the face is very close to the spoon the image formed by the outside bulged part?
A. Erect, larger
B. Diminished, inverted
C. Erect, smaller
D. Diminished, smaller

Answer 1

Hint: The outside bulged part of a spoon is like a convex mirror. While, the inside part of the spoon is like a concave mirror. In a concave mirror, when the object is placed very close to the mirror, the image formed is virtual and magnified. If the image is far away from the mirror, then the image formed is real and inverted. In a convex mirror, when the object is far from the mirror the image is small but when it starts coming close to the mirror the size of the image increases (maximum up to the size of the object).

Complete answer:
Inner part of a spoon acts as a concave mirror whereas the outer part i.e. bulged part as a convex mirror. We know, the image formed by a convex mirror is virtual, erect, diminished and smaller than the size of the image itself. But, as the objects come towards the mirror, the size of the image starts increasing. So, when we are closest to the spoon, the size of the image is largest (maximum up to the size of our face).
Thus, when the face is very close to the spoon, the image formed by the outside bulged part is erect, diminished and smaller.

So, the correct answers are option C and D i.e. erect, smaller and diminished, smaller respectively.

Note:
To answer these types of questions, students must have a clear knowledge about the formation of the images on a concave mirror, convex mirror, concave lens and convex lens. Students must also remember that the image formed on a convex mirror and a concave mirror depends on the position of the object from the mirror. The size of the image in case of a convex mirror will never exceed the size of the object.