Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) A lamp of negligible height is placed on the ground `l_1` ,away from a wall. A man `l_2` m tall is walking at a speedof `l_1/10` m/s , from the lamp to the nearest point on the wall. When he is midway between the lamp and the wall, the rate of change in the lengh of this shadow on the wall is - Sarthaks eConnect

A lamp of negligible height is placed on the ground `l_1` ,away from a wall. A man `l_2` m tall is walking at a speed of `l_1/10` m/s , from the lamp to the nearest point on the wall. When he is midway between the lamp and the wall, the rate of change in the lengh of this shadow on the wall is

A lamp of negligible height is placed on the ground `l_1` ,away from a wall. A man `l_2` m tall is walking at a speed of `l_1/10` m/s , from the lamp to the nearest point on the wall. When he is midway between the lamp and the wall, the rate of change in the lengh of this shadow on the wall is

A.

`-(5l_2)/2` m/s

B.

`-(2l_2)/5` m/s

C.

`-(l_2)/2` m/s

D.

`-(l_2)/5` m/s