protect the collector from dust

reduce the heat losses from collector beneath to atmosphere

transmit solar radiation only

all of the above

flat plate collectors

focusing or concentrating collectors

solar ponds

any of the above

direct thermal applications

fuel from biomass

solar electric applications

all of the above

cylindrical parabolic and paraboloid

flat plate collector

both A and B

none of the above

25%

15%

40%

60%