SABRINA

WHATS THE ANSWER TO #7 DOWN

A child of height 1.2 metres stands 3 metres from the foot of a lamp post of height 2.8 metres, at the top of which there is a small source which can be considered as a point. What is the length of the shadow cast by the child upon the ground?

would what the nature of the shadow on the floor be if the point of source of light is replaced by a luminous disc of diameter 5 cm, whose centre lies directly above the centre of the card?

please help A circular opaque disk, 25 cm in diameter, is set up 30 cm from a circular source of light of diameter 40 cm. A screen is placed 30 cm beyond the opaque disk. Describe, giving dimensions, the nature of the shadow on the screen

is it D/5.8= 1.2/2.8 D= (5.8x1.2)/2.8 D= 2.48m ??

THANK YOU!

WHAT DOES PI STAND FOR?

thank you would what the nature of the shadow be if the point of source of light is replaced by a luminous disc of diameter 5 cm, whose centre lies directly above the centre of the card?

thank you what would the dimension of shadow be?

thank you

can someone help? i am really struggling

could i have a clue or a starting point please?

thanks for your help

i have worked out the diameter of the umbra to be 25 cm, is this correct?....