Understanding Light and Mirrors in a Bookstore

Why is the cashier unable to see the customer standing behind the shelf?

• The cashier is not paying attention.

• The shelf is too tall.

• The store is too dark.

• The light reflected off the customer is blocked by the shelf.

What is the main reason mirror B is not a suitable position for the first mirror?

• It is too close to the entrance.

• Light from the customer cannot reach it due to the shelf.

• It is blocked by another shelf.

• It is too far from the cashier.

Where should the first mirror be placed to ensure visibility of the customer?

• Position C

• Position B

• Position D

• Position A

Why can't the second mirror be placed at position C?

• It is too expensive.

• It is not visible to the cashier.

• It is blocked by the shelf.

• It is too far from the first mirror.

What are the correct positions for the mirrors to allow the cashier to see the customer?

• Positions A and B

• Positions C and D

• Positions B and D

• Positions A and C