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Bre(a) in cene18 When light falls perpendicular on plane object.It forms an image of object similar to object.Rahul was conducting an experiment on light. Indark room. He took a square card board of side30 cm and cut out a scalene triangle APQR of sides3 cm, 6 cm, 5 cm from it. Upon throwing light Torchperpendicular to card board an illustrated triangularimage AABC is formed on the opposite wall.Rahul measured length of AB as 21 cm. Then,answer the following questions.What is the length of BC? |
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