40 POINTS Can someone please answer question 8 and 9 for me please

Physics

2 answers:

fgiga [73]3 years ago

8 0

⚘Refer to the attachment!!~ :)

Sorry but the question 9th is out of my expertise

Artist 52 [7]3 years ago

5 0

Answer:

for 8th one it is 33.4k joules and for ninth one i think 95degree C.

Explanation:

hope this helps

thank you.

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A concave lens has a focal length of 25cm. it's power in diaptor is

IgorLugansk [536]

As we know that :

$\begin{gathered}\large{\boxed{\sf{P \: = \: \dfrac{1}{f}}}} \\ \\ \rightarrow {\sf{P \: = \: \dfrac{1}{-25}}}\end{gathered}$

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$\begin{gathered}\rightarrow {\sf{P \: = \: \dfrac{1}{\dfrac{-25}{100}}}} \\ \\ \rightarrow {\sf{P \: = \: \dfrac{-100}{25}}} \\ \\ \rightarrow {\sf{P \: = \:- 4}} \\ \\ \underline{\sf{\therefore \: Power \: of \: Concave \: lens \: is \: - \: 4D}}\end{gathered}$