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Total internal reflection (TIR) is the phenomenon that involves the reflection of the entire incident light off the boundary. Glass prisms can be shaped to produce total internal reflection and as such are employed in binoculars, periscopes, telescopes, and other optical instruments. For the prism used in periscope, the light rays hit the inside surface at an angle greater than the critical angle of 42 and hence they are internally reflected.
‘A’ can do a piece of work in 15 days. ‘B’ can do 70% of the same work in 20 days. If they work together for the entire time and...
Sufficient food-supply was arranged to last for 30 days for 250 soldiers. If 50 soldiers did not attend the camp, for how many extra days will the food-...
A’ and ‘B’ together can complete a work in 18 days while ‘A’ takes 36 days to complete the same work alone. If ‘C’ is 50% more efficient t...
A and B together can complete a piece of work in 12 days. A alone can complete the work in 20 days. A starts the work and is joined by B after 5 days. H...
‘A’ and ‘B’ can complete a certain work in 16 days and 32 days, respectively. They started working together and worked till completion of the wo...
P’s 5 days work is equal to Q’s 6 days work. If P and Q together can complete the work in 25 days then how much time Q will take to complete 80% of ...
'Amit' alone can do some work in 15 days. 'Bunty' is 40% more efficient than 'Amit'. 'Amit' worked alone for 4 days and left. How much time (in days) do...
Jack is twice efficient as Jill and Jill can do a piece of work in 30 days. Jill started the work and after a few days Jack joined him. They completed t...
A contractor undertook to make 20 km of roadway in 48 weeks. In 28 weeks, 8 km was completed by 120 men working 12 hours a day. The men then agreed to w...
A alone work for 6 days then left the work and B alone finishes remaining work in 12 days. If ratio of time taken by A alone to B alone to finish work ...