Question

1. Hold a large shiny metal spoon at arm’s length with the concave side facing you. You should see your image in the spoon.

Question 5. Is your image upright or inverted (i.e. is your image upside down)?

2. Now flip the spoon around so that the convex side is facing you. Go back and forth between the convex and concave sides and note how the images are different for your report.

Question 6. Use the mirror equation to determine whether your image is real or virtual in the two cases (convex and concave). Assume the focal distance is 1 cm. (Be sure to use the correct signs, refer to the sign conventions for mirrors if necessary.)

Answer 1

Answers :-

5. When the concave side of the spoon is in front of us, there forms an inverted image in the mirror. This is beacuse the concavity of the spoon is generally such that the distance of the spoon from us is generally greater than the focal length of spoon. And when the convex side is in front, then the upright image forms.

6. For Concave Side :-

Let I'm standing 10cm away from spoon,

f = -1cm , u = -10cm

Using Mirrors Formula,

1/f = 1/u +1/v

1/(-1) = 1/(-10) + 1/v

1/10 - 1/1 = 1/v

-9/10 = 1/v

v = -1.11cm

The negative sign here showing that the image is formed on same side of the object. So, the image is real and inverted.

For Convex side,

f = +1cm , u = -10cm

1/(+1) = 1/(-10) + 1/v

1/1 + 1/10 = 1/v

11/10 = 1/v

v = +0.909cm

The positive sign here showing that the image formed behind the mirror. So, the image is virtual and upright.