5. a concave mirror gives virtual, refract and enlarged image of the object but image of smelter se
than the size of the object is
a. at infinity
b. between f and c
c. between p and f
d. at e
6. in optics an object which has higher refractive index is called
a. optically rarer
b. optically denser
c. optical density
d. refractive index
7. the optical phenomena, twinkling of stars, is due to
a. atmospheric reflection
b. total reflection
c. atmospheric refraction
fraction
pl me answer the above questions plzzz

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

3. dark matter

empty space could also be a simple vacuum

the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.