about selecting lines

Hello ,
i got text file like that'

C:\Users\Public\Pictures\Sample Pictures\aa.jpg
C:\Users\Public\Pictures\Sample Pictures\thumb.jpg
C:\Users\Public\Pictures\vv\cc.jpg
C:\Users\Public\Pictures\Sample Pictures\ee.jpg
C:\Users\Public\aa\Sample Pictures\cvswsr.jpg
C:\Users\Public\xx\Sample Pictures\gtgtg.jpg
C:\Users\Public\Pictures\Sample Pictures\
C:\Users\Public\bb\Sample Pictures\thumb.jpg
C:\Users\Public\Pictures\Sample Pictures\qq.jpg
C:\Users\Public\Pictures\nn\thumb.jpg

what i want to do is i want to take line ending with thumb.jpg like

C:\Users\Public\Pictures\Sample Pictures\thumb.jpg
C:\Users\Public\bb\Sample Pictures\thumb.jpg
C:\Users\Public\Pictures\nn\thumb.jpg

Many thanks for any replies

grep 'thumb.jpg$' yourtextfile